Eur. J.Entomol. 98: 387-413, 2001 ISSN 1210-5759

Species of (Collembola: ) from the Neotropical region

Wanda Maria WEINER1 and J udith NAJT

'Institute o f Systematics and Evolution ofAnimals, Polish Academy o f Sciences, Slawkowska 17, Pl-31 016 Krakow, Poland, e-mail: [email protected] 2UPRES-A CNRS 8043, Laboratoire d’Entomologie, Muséum national d’Histoire naturelle, 45, rue Buffon, F-75005 Paris, France, e-mail: [email protected]

Key words. Collembola, Brachystomellidae, Brachystomella, Neotropical region, new species, diagnosis, key

Abstract. In this paper six new species of the genus Brachystomella Agren from the Neotropical region are described : B. desutte- rae sp. n. (Peru), B. mataraniensis sp. n. (Peru), B. pefauri sp. n. (Venezuela), B. purma sp. n. (Peru), B. saladaensis sp. n. (Argen­ tina) and B. zerpa sp. n. (Venezuela). Brachystomella honda Christiansen & Bellinger, 1988 is synonymised withBrachystomella baconaoensis Gruia, 1983. Diagnoses and comments on the original descriptions as well as remarks on 22 species are included.

INTRODUCTION Abbreviations. ISEA - Institute of Systematics and Najt & Weiner (1996) revised the list of species of the Evolution of , Polish Academy of Sciences, genus Brachystomella, which currently includes 52 spe­ Krakow, Poland; MNHN - Laboratoire d’Entomologie, cies, out of which 25 occur in the Neotropical region. In Muséum national d’Histoire naturelle, Paris, France. the Catalogue of Neotropical Collembola by Mari Mutt & SYSTEMATIC ACCOUNT Bellinger (1990) there are 29 species ofBrachystomella . Brachystomella agrosa Wray, 1953 However, this list was assembled from the literature Brachystomella maxima Cassagnau & Rapoport, 1962 without critical evaluation of the species. B. allendei Remarks. According to Na jt et al. (1990), males of this Massoud & Rubio (in Hermosilla & Rubio, 1976) is species possess secondary sexual characters on genital nomen nudum. Specimens from this region determined as papilla. Sensory organ of antennal segment III with two B. parvula, with the“ parvula” type of furca, should be guard setae between guard sensilla. Tibiotarsi I, II and III called B. ca. parvula (Schaeffer, 1896).B. rosai (Bonet, with 19, 19 and 18 setae respectively; seta M present, seta 1934) belongs to the genus Setanodosa Salmon. B. trini- B7 absent on tibiotarsus III. Femora I, II and III with 12, tata (Jackson, 1927) (probably = B. septemoculata Denis, 11 and 10 setae, trochanters I, II and III with 5, 5 and 4 1931) was identified on the basis of immature specimens setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae (Massoud, 1967). B. subandinensis Massoud, 1967 is a “2” I, II and III with 0, 2 and 2 setae, subcoxae “1” I, II new synonym for B. contorta Denis, 1931. and III with 1, 2 and 2 setae respectively. Even anal Two other species should also be mentioned, as they valves each with two setae hr. may belong to the genus Brachystomella. These are: asper Borner, 1906, described from Brachystomella baconaoensis Gruia, 1983 Brasil and subcrassa Schaffer, 1897, Brachystomella honda Christiansen & Bellinger, 1988 described from Argentina. However, at present it is not syn. nov. possible to resolve this problem, because the type mate­ Diagnosis. Habitus and buccal cone typical for the rial has been lost (Strumpel, personal comm.). genus Brachystomella. Postantennal organ with 5-7 vesi­ In the material from Argentina, Peru and Venezuela we cles. 8+8 eyes present. Formula of sensory setae s per half found six new species, which are described below. We tergum: 022/21111. Head without seta a0, setae c3, c5 also examined the types and additional material of 22 spe­ present. Thoracic tergum I with 3+3 setae. Reduced furca cies, commented on the original descriptions and pro­ with 3 setae on each dens. Mucro present. Tibiotarsi I, II vided some additional remarks. We were not able to and III with 18, 18 and 17, setae respectively; seta A1 is examine one species: Brachystomella sexoculata Mas­ capitate, seta M absent (except a single anomaly in one soud, 1967 because the type material was not preserved. specimen). Subcoxae “2” I, II and III with 0, 2 and 2 We also synonymised Brachystomella honda Christiansen setae, respectively. Even anal valves each with three setae & Bellinger, 1988 withBrachystomella baconaoensis hr. Gruia, 1983. Redescription. Antennae shorter than head (about 3/4 This study confirms that most of the species of Bra­ the length of head). Antennal segment I with 7 setae, chystomella occur the Neotropical region (Najt & Weiner, antennal segment II with 12 setae. Antennae III and IV 1996). fused dorsally, ventral separation well marked. Sensory

387 organ of antennal segment III consisting of: two small Brachystomella barrerai Palacios-Vargas & Najt, 1981 globular internal sensilla, two subcylindrical guard sen- Remarks. Sensory organ of antennal segment III with silla (dorsolateral sensillum shorter than ventrolateral two guard setae between guard sensilla. Tibiotarsi I, II one) and two guard seta between them; ventral microsen- and III with 18, 18 and 17 setae, respectively, of which 3, sillum present. Antennal segment IV with rather long 4 and 4 capitate (not 3, 3, 4 as in the original description ordinary setae, with 6 subcylindrical sensilla only slightly by Palacios-Vargas & Najt 1981); setae A1, A2, T3 capi­ distinct (not as in the description of Gruia 1983); dorso- tate on tibiotarsus I, setae A1, A2, A7, T3 capitate on tibi­ external microsensillum present, truncated subapical otarsi II and III, seta M absent, seta B7 absent on organite present; simple apical vesicle in deep cavity, tibiotarsus III. Femora I, II and III with 12, 11 and 10 ventral side with a few truncated setae. setae, trochanters I, II and III with 5, 5 and 4 setae, coxae Postantennal organ 1.2—1.4 times larger than ocellus B, I, II and III with 3, 6 and 7 setae, subcoxae “2” I, II and bearing 5—7 vesicles. Eyes 8+8. Buccal cone typical for III with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, the genus. Mandible absent, maxilla with 9 teeth (not as 2 and 2 setae, respectively. Even anal valves each with in the original description of B. honda). Labral three setae hr. chaetotaxy: 2/2334. Dorsal chaetotaxy with smooth acuminate mesochaetae, Brachystomella chilensis (Rapoport & Rubio, 1963) with long sensory setae s. Their formula per half tergum: Organella chilensis Rapoport & Rubio, 1963. 022/21111. Microsensilla present on thoracic tergum II. Figs 1-6 Head without seta a0, setae c3 and c5 present. Thoracic Diagnosis. Habitus and buccal cone typical for the tergum I with 3+3 setae. Abdominal terga I- IV with seta genus Brachystomella. Postantennal organ with four vesi­ s = p4. Thoracic sterna without setae. Ventral tube with cles. 5+5 eyes present, eyes D, F and H absent. One guard 3+3 setae, abdominal sternum II with 1+1 setae. seta between guard sensilla in sensory organ of antennal Furca with four setae on each dens. Mucro with hooked segment III present. Very short ordinary setae, formula of apex and lamella (not as in the description of B. sensory setae s per half tergum: 022/21111. Head with baconaoensis). Ratio mucro : dens = 1 : 1.5—1.75. setae a0, c3, c5 present, sd5 absent. Thoracic tergum I Tenaculum with 3+3 teeth. Only preadult male known. with 3+3 setae. Furca well developed with 6 setae on Even anal valves each with three setae hr. each dens. Mucro straight with apex slightly hooked. Tibiotarsi I, II and III with 18, 18 and 17 setae, respec­ Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ tively; A1 capitate; seta M absent (one specimen with 18 tively, with seta M almost in row B. Subcoxae “2” I, II setae on tibiotarsi III - seta M present), seta B7 absent on and III with 0, 2 and 2 setae, respectively. Even anal tibiotarsus III. Femora I, II and III with 12, 11 and 10 valves each with three setae hr. setae, trochanters I, II and III with 5, 5, 4 setae, coxae I, II Redescription. Antennae shorter than head (about 3/4 and III with 3, 6 and 7 setae, subcoxae “2” I, II and III the length of head). Antennal segment I with 7 setae, with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, 2 antennal segment II with 12-13 setae. Antennae III and and 2 setae, respectively. Claw with inner tooth at half IV fused dorsally, ventral separation well marked. Sen­ length of its inner edge, with a pair of lateral teeth. Empo- sory organ of antennal segment III consisting of: two dial appendage absent. small globular internal sensilla, two subcylindrical guard Type material. Lectotype 2 , paralectotypes: k (preadult) sensilla (both the same size) and one guard seta between and 2 2 2 presently designated, in Institutul de Speologie “Emil them; ventral microsensillum present. Antennal segment Racovitza”, Bucharest, Romania. IV with rather short ordinary setae, with 5 only slightly Type locality. Cuba, Rio Baconao (Oriente), in a sand on the distinct subcylindrical sensilla; dorsoexternal microsen­ beach at the mouth o f river, about 50 m o f the seashore, March sillum present, truncated subapical organite present; 24, 1973, lgt. L. Boto§aneau. apical vesicle simple in a deep cavity, ventral side with a Other locality. USA, Florida: Monroe Co., Bahia Honda few truncated setae (Fig. 3). Key, on rocky tide flats, January 5, 1985, lgt. K. Christiansen, 2 paratypes. Postantennal organ (Fig. 2) almost 1.6 times larger than Discussion. Brachystomella baconaoensis Gruia, 1983 ocellus B, bearing 4 vesicles. Eyes 5+5, eyes D, F and H is most similar to B. neomexicana (Scott, 1960). They absent. Buccal cone typical for the genus. Mandible have the same number of setae on tibiotarsi (also the capi­ absent, maxilla with 6 teeth (not 5 as in original descrip­ tate setae), femora, trochanters, coxae, subcoxae “I” and tion by Rapoport & Rubio, 1963) (Fig. 4). Labral chaeto­ “II”, the same number of setae hr on even valves (3). taxy: 2/2334. They differ in the number of setae on the dens (4 in B. Dorsal chaetotaxy as in Fig. 1 with very short ordinary baconaoensis and 5—6 in B. neomexicana) and in the setae, with longer sensory setae s. Their formula per half shape of the apical vesicle on antennal segment IV tergum: 022/21111. Microsensilla present on thoracic (simple in B. baconaoensis and trilobated in B. neomexi­ tergum II. Head with setae a0, c3 and c5 present, seta sd5 cana). We examined the type material ofBrachystomella absent. Thoracic tergum I with 3+3 setae. Abdominal baconaoensis Gruia, 1983 and Brachystomella honda terga I-III with seta s = seta p4, abdominal tergum IV Christiansen & Bellinger, 1988 and concluded that B. with seta s = p3. Thoracic sterna without setae. Ventral honda is a new synonym of B. baconaoensis Gruia. tube with 3+3 setae, abdominal sternum I without setae, abdominal sternum II with 1+1 setae.

388 1 3

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Figs 1-6. Brachystomella chilensis (Rapoport & Rubio, 1963). 1 - dorsal chaetotaxy (scale 0.1 mm); 2 - postantennal organ and eyes (scale 0.1 mm); 3 - antennal segments III and IV, dorsolateral view (scale 0.1 mm); 4 - maxillum (scale 0.05 mm); 5 - dens and mucro (scale 0.1 mm); 6 - tibiotarsus III (scale 0.1 mm).

Furca well developed with 6 setae on each dens (Fig. nile males known). Even anal valves each with three setae 5). Mucro straight with apex slightly hooked. Ratio hr. mucro : dens = 1 : 2.72. Tenaculum with 3+3 teeth. Males Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ probably without secondary sexual characters (only juve­ tively, with acuminate distal seta; seta M in row B, seta

389 B7 absent on tibiotarsus III. Femora I, II and III with 13, terga I-IV with seta s = seta p3. Thoracic sterna without 12 and 11 setae, trochanters I, II and III with 6, 6 and 6 setae. Ventral tube with 3+3 setae, abdominal sternum I setae, coxae I, II and III with 3, 6 and 7 setae, respec­ without setae, abdominal sternum II with 1+1 setae. tively; subcoxae “2” I, II and III with 0, 2 and 2 setae, Furca well developed with 5 setae on each dens, with subcoxae “1” I, II and III with 1, 2 and 2 setae, respec­ bent mucro (Fig. 13). Ratio mucro : dens = 1 : 2.2. tively. Claw with inner tooth at 1/3 length of its inner Tenaculum with 3+3 teeth. Males with secondary sexual edge, with pair of lateral teeth (Fig. 6). Empodial characters on genital papilla (Fig. 12). Even anal valves appendage absent. each with two setae hr. Type material. Lectotype juvenile k and 5 paralectotypes: 2 Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ 2 2 ,3 juveniles presently designated, in Museo National de tively, with acuminate distal seta; seta M in row B, seta Historia Natural, Santiago, Chile; 1 paralectotype from Rapo- B7 absent on tibiotarsus III. Femora I, II and III with 12, port’s collection (juvenile k) in Museo Nacional de Historia 11 and 10 setae, trochanters I, II and III with 5, 5 and 4 Natural, La Plata, Argentina. setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae Type locality. Chile, crest of “El Roble” 2200 m a.s.l., “2” I, II and III with 0, 1-2 and 2 setae, subcoxae “1” I, II 18.viii.1961, lgt. I.Rubio. and III with 1, 2 and 2 setae, respectively. Claw with Discussion. Brachystomella chilensis (Rapoport & inner tooth at 1/3 length of its inner edge, with pair of lat­ Rubio), 1963, with B. montebella Najt & Pala­ eral teeth (Fig. 11). Empodial appendage absent. cios-Vargas, 1986 and B. pefauri sp. n. belong to the Type material. Lectotype 2 presently designated, in MNHN. same group of species having the same number of eyes: Type locality. Costa Rica, Puente de las Mulas, iii. 1916, lgt. 5+5, and the same number of setae on thoracic tergum I J. Fig. Tristan. Costa Rica, San José, (no date) lgt. J. Fig. (2+2) (see discussion in B.pefauri sp. n.). Tristan, 4 specimens; Costa Rica, Buenos Aires, San Isidro, Brachystomella contorta Denis, 1931 plantation o f Papaya, lgt. I. Rubio & W. Hermosilla, 3 speci­ mens. Brachystomellasubandinensis Massoud, 1967, syn. nov. Discussion. In the group of species of Brachystomella Brachystomella sabandinensis Winter, 1962, nomen without seta a0 on head and with 5 setae on dens Bra­ nudum. chystomella contorta is closest to Brachystomella septe- Figs 7-13 moculata (see discussion of B. septemoculata). We exam­ Diagnosis. Habitus and buccal cone typical for the ined the type material of Brachystomella subandinensis genus Brachystomella. Postantennal organ with five vesi­ Massoud, 1967 and concluded that it is a new synonym of cles. 8+8 eyes present. Very short ordinary setae, formula Brachystomella contorta. of sensory setae s per half tergum: 022/21111. Head without setae a0 and sd1, with setae c3 and c5 present. Brachystomella cyanea (Rapoport, 1962) Thoracic tergum I with 2+2 setae. Furca well developed Brachygastrura cyanea Rapoport, 1962 with 5 setae on each dens. Bent mucro present. Tibiotarsi Figs 14-19 I, II and III with 19, 19 and 18 setae, respectively, with Diagnosis. Habitus and buccal cone typical for the seta M almost in row B. Subcoxae “2” I, II and III with 0, genus Brachystomella. Postantennal organ with 7-10 2 and 2 setae, respectively. Even anal valves each with vesicles. 8+8 eyes present. Mesochaetae and serrated two setae hr. macrochaetae present, formula of sensory setae s per half Redescription. Antennae shorter than head (about 3/4 tergum: 022/21111. Head with setae a0, c1, c2 and c5. the length of head). Antennal segment I with 7 setae, Thoracic tergum I with 2+2 setae. Reduced furca with 3 antennal segment II with 12 setae. Antennae III and IV setae on each dens. Mucro absent. Tibiotarsi I, II and III fused dorsally, ventral separation well marked. Sensory with 19, 19 and 18 setae, respectively, with seta M almost organ of antennal segment III consisting of: two small in row B. Subcoxae “2” I, II and III with 0, 2 and 2 setae, globular internal sensilla, two subcylindrical guard sen- respectively. Even anal valves each with two setae hr. silla (dorsolateral sensillum shorter than ventrolateral Redescription. Antennae shorter than head (about 3/4 one) and two guard setae between them; ventral micro- the length of head). Antennal segment I with 7 setae, sensillum present. Antennal segment IV with rather short antennal segment II with 12 setae. Antennae III and IV ordinary setae, with 6 slightly distinct subcylindrical sen­ fused dorsally, ventral separation well marked. Sensory silla; dorsoexternal microsensillum present, truncated organ of antennal segment III consisting of: two small subapical organite present; apical vesicle simple in deep globular internal sensilla, two subcylindrical guard sen­ cavity, ventral side with a few truncated setae. (Fig. 9). silla (both of the same size) and two guard setae between Postantennal organ (Fig. 8) almost 1.5 times larger than them; ventral microsensillum present. Antennal segment ocellus B, bearing five vesicles. Eyes 8+8. Buccal cone IV with rather long ordinary setae, with 6 slightly distinct typical for the genus. Mandible absent, maxilla with 7 subcylindrical sensilla; dorsoexternal microsensillum pre­ teeth (Fig. 10). Labral chaetotaxy: 2/2334. sent, truncated subapical organite present; apical vesicle Dorsal chaetotaxy as in Fig. 7 with very short ordinary simple in deep cavity, ventral side with a few truncated setae, with longer sensory setae s. Their formula per half setae (Fig. 16). tergum: 022/21111. Microsensilla on thoracic tergum II Postantennal organ (Fig. 17) 2.5 times larger than present. Head without setae a0 and sd1, setae c3 and c5 ocellus B, bearing 7-10 vesicles. Eyes 8+8. Buccal cone present. Thoracic tergum I with 2+2 setae. Abdominal

390 0.05 mm); 9 - antennal segments III and IV, dorsal view (scale 0.05 mm); 10 - maxillum (scale 0.05 mm); 11 - tibiotarsus III (scale 0.05 mm); 12 - male genital plate (scale 0.05mm); 13 - dens, mucro and tenaculum (scale 0.05 mm). typical for the genus. Mandible absent, maxilla with 7 Dorsal chaetotaxy as in Fig. 14 with serrated meso- and teeth (Fig. 15). Labral chaetotaxy: 2/2334. macrochaetae, with long sensory setae s. Their formula per half tergum: 022/21111. Microsensilla on thoracic

391 maxillum (scale 0.05 mm); 16 - antennal segments III and IV, dorsolateral view (scale 0.05 mm); 17 - postantennal organ and eyes (scale 0.05 mm); 18 - tibiotarsus III (scale 0.05 mm); 19 - male secondary sexual characters and furca (scale 0.05 mm). tergum II present. Head with setae a0, c1, c2 and c5. Tho- tube with 3+3 setae, abdominal sternum I without setae, racic tergum I with 2+2 setae. Abdominal terga I-IV with abdominal sternum II with 1+1. seta s = seta p3. Thoracic sterna without setae. Ventral

392 Reduced furca with 3 setae, rarely with 4 setae on each setae and 6 subcylindrical sensilla; dorsoextemal micro- dens (Fig. 19). Mucro absent. Tenaculum with 2+2 teeth. sensillum, subapical organite present; apical vesicle trilo- Males with secondary sexual characters on genital papilla bated, ventral side with a few blunt setae (Fig. 22). and abdominal tergum IV (Fig. 19). Even anal valves Postantennal organ (Fig. 23) about 1.75 times larger each with two setae hr. than ocellus B, bearing 5 vesicles. Eyes 8+8. Buccal cone Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ typical for the genus. Mandible absent, maxillae each tively, with acuminate distal seta; seta M between setae with 7 teeth (Fig. 21). Labral chaetotaxy: 2/2334. B4 and B5, seta B7 absent on tibiotarsus III. Femora I, II Dorsal chaetotaxy as in Fig. 20 with very short ordinary and III with 12, 11 and 10 setae, trochanters I, II and III setae, with longer sensory setae s. Their formula per half with 5, 5 and 4 setae, coxae I, II and III with 3, 6 and 7 tergum: 022/21111. Microsensilla present on thoracic setae, subcoxae “2” I, II and III with 0, 2 and 2 setae, sub­ tergum II. Head without setae a0 and sd1, setae c2 and c5 coxae “1” I, II and III with 1, 2 and 2 setae, respectively. present. Thoracic tergum I with 2+2 setae. Abdominal Claw with inner tooth at half length of its inner edge, with terga I-IV with seta s = p3. Thoracic sterna without setae. pair oflateral teeth (Fig. 18). Empodial appendage absent. Ventral tube with 3+3 setae, abdominal sternum I without Type material. Lectotype juvenile k and 11 paralectotypes setae, abdominal sternum II with 1+1 setae. presently designated, in Museo de La Plata, Argentina. Furca well developed with 5 setae on each dens (Fig. Type locality. Argentina, Gonzales Chaves, half-bog, 25). Mucro straight with apex slightly hooked. Ratio 8.i.1962, lgt. E.H. Rapoport. mucro : dens = 1 : 2.25. Tenaculum with 3+3 teeth. Males Other material. Argentina, La Plata, Los Hornos, unknown. Even anal valves each with one seta hr. 12.vii.1972, lgt. A. Alzuet, 3 specimens. Tibiotarsi I, II and III with 19, 19 and 18 setae, Discussion. Brachystomella cyanea Rapoport, 1962 respectively, with acuminate distal setae, seta M present, differs from all the other species belonging in the genus seta B7 absent on tibiotarsus III. Femora I, II and III with Brachystomella in the following characters: serrated mac- 11,11 and 10 setae, trochanters I, II and III with 5, 5 and rochaetae, reduced furca, mucro absent, postantennal 4 setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae organ with 7-10 vesicles, 2+2 setae on thoracic tergum, “2” I, II and III with 0, 1 and 1 setae, subcoxae “1” I, II tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ and III with 1, 2 and 2 setae, respectively. Claw with tively. The shape of the dens resembles that of the furca inner tooth at half length of its inner edge, with pair of in B. minimucronata Palacios-Vargas & Najt, 1981, but lateral teeth (Fig. 24). Empodial appendage absent. the latter has serrated mesochaetae and capitate macro- Type material. Holotype 2 in MNHN, paratypes 8 juveniles chaetae, a very small mucro, postantennal organ with 3-5 in MNHN, 2 and 3juveniles in ISEA. vesicles, 3+3 setae on thoracic tergum I, tibiotarsi I, II Type locality. Peru, Brillo Nuevo, region o f Rio Ampiyacu, and III with 18, 18 and 17 setae, respectively (3, 4 and 4 confluence o f rivers Zumun and Yahuasyacu, litter in secondary of which are capitate). In both species the apical vesicle is forest o f 50 years ( = 53 years after clear felling) , 27.x.1985, simple, and the tenaculum possesses 2+2 teeth. lgt. L. Desutter-Grandcolas. Brachystomella desutterae sp. n. Other material. Peru, Brillo Nuevo, region o f Rio Ampiyacu, confluence o f rivers Zumun and Yahuasyacu, litter Figs 20-25 in secondary forest 5 years ( = 8 years after clear felling) , Diagnosis. Habitus and buccal cone typical for the 7.xi.1985, lgt. L. Desutter-Grandcolas, 7 specimens. genus Brachystomella. Postantennal organ with 7 Etymology. The new species is cordially dedicated to our vesicles. 8+8 eyes present. Very short ordinary setae, for­ colleague Laure Desutter-Grandcolas o f Laboratoire mula of sensory setae s per half tergum: 022/21111. Head d’Entomologie, Muséum national d’Histoire naturelle in Paris, without setae a0 and sd1, setae c2 and c5 present. Tho­ who kindly collected this material for us. racic tergum I with 2+2 setae. Furca well developed with Discussion. The new species is closest to B. contorta 5 setae on each dens. Mucro straight with apex slightly Denis, 1931. Both species share the same characters: hooked. Tibiotarsi I, II and III with 19, 19 and 18 setae, absence of setae a0, on the head, 2+2 setae on the respectively, with seta M. Subcoxae “2” I, II and III with thoracic tergum I, the same number of setae on the dens 0, 1 and 1 setae, respectively. Even anal valves each with (5), the same number of setae on tibiotarsi (19, 19, 18). one seta hr. They differ in the shape of the apical vesicle (simple inB. Description. Holotype (female) length 0.78 mm, para­ contorta and trilobated in the new species), in the number type (female) length 0.85 mm paratypes (juveniles) length of setae on femora I (12 in B. contorta and 11 in the new 0.51-0.65 mm. Colour in alcohol spotted bluish-grey, species), in the number of setae on subcoxae “2” II and ocular plate blue-black. III (2, 2 in B. contorta and 1, 1 in the new species), in the Antennae shorter than head (about 3/4 the length of number of setae hr on the even anal valves (two on each head). Antennal segment I with 7 setae, antennal segment valve in B. contorta and one in the new species). II with 12 setae. Antennae III and IV fused dorsally, ven­ Brachystomellagabrielae Najt & Palacios-Vargas, 1986 tral separation well marked. Sensory organ of antennal Remarks. Sensory organ of antennal segment III with segment III consisting of: two small globular internal sen- two guard setae between guard sensilla. Tibiotarsi I, II silla, two guard sensilla subcylindrical (both of the same and III with 19, 19 and 18 setae, respectively, (not 19, 18 size) and two guard setae between them; ventral micro- and 17 as in the original description by Najt & Palacios- sensillum present. Antennal segment IV with ordinary Vargas, 1986); seta M present, seta B7 absent on tibio-

393 Figs 20-25. Brachystomella desutterae sp. n. 20 - dorsal chaetotaxy (scale 0.1 mm); 21 - maxillum (scale 0.05 mm); 22 - antennal segments III and IV, dorsal view (scale 0.05 mm); 23 - postantennal organ and eyes (scale 0.05 mm); 24 - tibiotarsus II (scale 0.05 mm); 25 - dens and mucro (scale 0.05 mm). tarsus III. Femora I, II and III with 11, 10 and 10 setae, Brachystomella globulosa Cassagnau & Rapoport, 1962 trochanters I, II and III with 5, 5, 4 setae, coxae I, II and Figs 26-32 III with 4, 6 and 7 setae, subcoxae “2” I, II and III with 0, Diagnosis. Habitus and buccal cone typical for the 2 and 2 setae, subcoxae “1” I, II and III with 1, 2 and 2 genus Brachystomella. Postantennal organ with 4 setae, respectively. Even anal valves each with three setae vesicles. 8+8 eyes present. Short ordinary setae, some hr. mesochaetae, some serrated and slightly capitate setae on

394 Figs 26-32. Brachystomella globulosa Cassagnau & Rapoport, 1962. 26 - dorsal chaetotaxy (scale 0.1 mm); 27 - postantennal organ and eyes (scale 0.05 mm); 28 - antennal segments III and IV, dorsal view (scale 0.05 mm); 29 - maxillum (scale 0.05 mm); 30 - tibiotarsus III (scale 0.05 mm); 31 - male genital plate (scale 0.05mm); 32 - dens and mucro (scale 0.05 mm). abdominal segment VI, formula of sensory setae s per “2” I, II and III with 0, 2 and 2 setae, respectively. Even half tergum: 022/21111. Head with seta a0, c2 and c5 pre­ anal valves each with two setae hr. sent, seta d4 absent. Thoracic tergum I with 3+3 setae. Redescription. Antennae shorter than head (about 3/4 Short furca with 4 setae on each dens. Mucro with the length of head). Antennal segment I with 7 setae, hooked apex. Tibiotarsi I, II and III with 18, 18 and 17 antennal segment II with 11-12 setae. Antennae III and setae, respectively, of which 3, 4 and 4 capitate. Subcoxae IV fused dorsally, ventral separation well marked. Sen­ sory organ of antennal segment III consisting of: two

395 small internal sensilla globular distally, two subcylin­ Brachystomella grootaerti Najt, Thibaud & Jacquemart, drical guard sensilla (dorsolateral sensillum somewhat 1991 shorter than ventrolateral one) and two guard setae Remarks. Sensory organ of antennal segment III with between them; ventral microsensillum present. Antennal two guard setae between guard sensilla. Tibiotarsi I, II segment IV with rather long ordinary setae, with 6 only and III with 19, 19 and 18 setae, respectively (not 18, 18 slightly distinct subcylindrical sensilla; dorsoexternal and 17 as in the original description by Najt et al., 1991); microsensillum present, truncated subapical organite pre­ seta M present, seta B7 absent on tibiotarsus III. Femora sent; apical vesicle slightly trilobated in deep cavity, ven­ I, II and III with 12, 11 and 10 setae, trochanters I, II and tral side with a few truncated setae. (Fig. 28). III with 5, 5 and 4 setae, coxae I, II and III with 3, 6 and 7 Postantennal organ (Fig. 27) almost as large as ocellus setae, subcoxae “2” I, II and III with 0, 2 and 2 setae, sub­ B, bearing four vesicles. Eyes 8+8. Buccal cone typical coxae “1” I, II and III with 1, 2 and 2 setae, respectively. for the genus. Mandible absent, maxilla with 7 teeth (Fig. Even anal valves each with two setae hr. 29). Labral chaetotaxy: 2/2334. Dorsal chaetotaxy as in Fig. 26 with short ordinary Brachystomella mataraniensis sp. n. setae, some mesochaetae, some slightly serrated and Figs 33-39 slightly capitate setae on abdominal segment VI, with Diagnosis. Habitus and buccal cone typical for the long sensory setae s. Their formula per half tergum: genus Brachystomella. Postantennal organ with 4 022/21111. Microsensilla present on thoracic tergum II. vesicles. 8+8 eyes present. Very short ordinary setae, for­ Head with setae a0, c2 and c5, seta d4 absent. Thoracic mula of sensory setae s per half tergum: 022/21111. Head tergum I with 3+3 setae. Abdominal terga I-IV with seta with setae a0, c3 and c5. Thoracic tergum I with 3+3 s = p4. Thoracic sterna without setae. Ventral tube with setae. Furca well developed with 6 setae on each dens. 3+3 setae, abdominal sternum I without setae, abdominal Mucro straight with apex slightly hooked. Tibiotarsi I, II sternum II with 1+1 setae. and III with 19, 19 and 18 setae, respectively, with seta M Short furca with four setae on each dens (Fig. 32 ). almost in row B. Subcoxae “2” I, II and III with 0, 2 and Mucro with hooked apex. Ratio mucro : dens = 1 : 2.1. 2 setae, respectively. Even anal valves each with three Tenaculum with 3+3 teeth. Male with secondary sexual setae hr. characters on genital papilla (Fig. 31). Even anal valves Description. Holotype (female) length 0.98 mm, para- each with two setae hr. types (females) length 0.86-1.0 mm, paratypes (juvenile Tibiotarsi I, II and III with 18, 18 and 17 setae, respec­ males) length 0.60 mm and 0.65 mm. Colour in alcohol tively, of which 3, 4 and 4 capitate (not 3, 3 and 3 as in bluish-grey, occular plate blue-black. Entire body the original description by Cassagnau & Rapoport, 1962), coarsely granulated. seta A1(the strongest one), A2 (acuminate on tibiotarsus Antennae shorter than head (about 3/4 length of head). I), A7 and T2 capitate, without seta M, seta B7 absent on Antennal segment I with 7 setae (sometimes tibiotarsus III. Femora I, II and III with 12, 11 and 10 asymmetrical: 6 or 8 on one antenna), antennal segment II setae, trochanters I, II and III with 5, 5 and 4 setae, coxae with 12 setae (also asymmetrical: 11 or 13 setae). I, II and III with 3, 6 and 7 setae, subcoxae “2” I, II and Antennae III and IV fused dorsally, ventral separation III with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, well marked. Sensory organ of antennal segment III con­ 2 and 2 setae, respectively. Claw with inner tooth at 2/3 sisting of: two small globular internal sensilla, two rather length of its inner edge, without lateral teeth (Fig. 30). short subcylindrical guard sensilla (both of the same size) Empodial appendage absent. and two guard setae between them; ventral microsen­ Type material. Lectotype k, paralectotypesjuvenile 2 and 2 sillum present. Antennal segment IV with rather short juveniles presently designated, in MNHN. ordinary setae, with 6 distinct subcylindrical sensilla; dor­ Type locality. Argentina, province of Tucuman, south of soexternal microsensillum present, truncated subapical Tapia, under bark, 20.iv.1959, lgt. Cl. Delamare Deboutteville organite present; apical vesicle simple, ventral side with a and E.H. Rapoport. few blunt setae (Fig. 35). Discussion. Brachystomella globulosa Cassagnau & Postantennal organ (Fig. 34) almost two times larger Rapoport, 1962 possesses short furca like B. villalobosi than ocellus B, bearing 4 vesicles. Eyes 8+8. Buccal cone Cassagnau & Rapoport, 1962, B. barrerai Palacios- typical for the genus. Mandible absent, maxilla with 7 Vargas & Najt, 1981 and B. minimucronata Palacios- teeth (Fig. 36). Labral chaetotaxy: 2/2334. Vargas & Najt, 1981 (with very reduced mucro). All Dorsal chaetotaxy as in Fig. 33 with very short ordinary these species have some capitate setae on the body, 2-4 setae, with longer sensory setae s. Their formula per half capitate setae on tibiotarsi. B. globulosa has the same tergum: 022/21111. Microsensilla present on thoracic number of capitate setae on tibiotarsi I, II and III (3, 4 and tergum II. Head with setae a0, c3 and c5 present. Tho­ 4) like B. barrerai and B. minimucronata (2, 3 and 3 in B. racic tergum I with 3+3 setae. Abdominal terga I-IV with villalobosi). It differs in the number of setae on each dens seta s = p4. Thoracic sterna without setae. Ventral tube (4 in B. globulosa, and 3 in the other species) and in the with 3+3 setae, abdominal sternum I with 0+0 setae, number of setae hr on the even valves (two in B. globu­ abdominal sternum II with 1+1setae. losa and three in the all other species). Furca well developed with 6 setae on each dens (Fig. 39). Mucro straight with apex slightly hooked. Ratio

396 Figs 33-39.Brachystomella mataraniensis sp. n. 33 - dorsal chaetotaxy (scale 0.1 mm); 34 - postantennal organ and eyes (scale 0.05 mm); 35 - antennal segments III and IV, dorsolateral view (scale 0.05 mm); 36 - maxillum (scale 0.05 mm); 37 - tibiotarsus III (scale 0.05 mm); 38 - male genital plate (scale 0.05mm); 39 - dens and mucro (scale 0.05 mm). mucro : dens = 1 : 2. Tenaculum with 3+3 teeth. Males B7 absent on tibiotarsus III. Femora I, II and III with 12, with secondary sexual characters on genital papilla (Fig. 11 and 10 setae, trochanters I, II and III with 5, 5 (asym­ 38). Even anal valves each with three setae hr. metry: 3 or 4), and 4 setae, coxae I, II and III with 3, 6 Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ and 7 setae, subcoxae “2” I, II and III with 0, 2 and 2 tively, with acuminate distal seta; seta M in row B, seta setae, subcoxae “1” I, II and III with 1, 2 and 2 setae,

397 respectively. Claw with inner tooth at half length of its and 14 as in the original description by Rubio & Najt, inner edge, with pair of lateral teeth (Fig. 37). Empodial 1979); seta M present, seta B7 absent on tibiotarsus III. appendage absent. Femora I, II and III with 12?, 11 and 10 setae, trochanters Type material. Holotype 2 in MNHN, paratypes: 7 2 2 ,1 1, II and III with 5, 5 and 4 setae, coxae I, II and III with juvenile k in MNHN; 3 2 2 and ljuvenile k in ISEA. 2, 3 and 3 setae, subcoxae “2” I, II and III with 0, 1 and 1 Type locality. Peru, Matarani, El Camino, 23.ix. 1974, lgt. J. setae, subcoxae “1” I, II and III with 1, 2 and 2 setae, Péfaur. respectively. Even anal valves each with three setae hr. Other material. Peru, Matarani, Platanillo II, 16.vii.1974, 2 specimens, 23.ix.1974, lgt. J. Péfaur, 11 specimens. Brachystomella neomexicana (Scott, 1960) Etymology. The name of the new species is derived from the Neanurodesneomexicanus Scott, 1960 type locality. Brachystomella arida Christiansen & Bellinger, 1980 Discussion. Of the species of Brachystomella, with Remarks. Sensory organ of antennal segment III with four vesicles in the postantennal organ, the new species is two guard setae between guard sensilla. Tibiotarsi I, II closest to Brachystomella victoriensis from Argentina and III with 18, 18 and 17 setae, respectively; seta A1 (Izarra, 1972). The two species differ in the shape of the slightly capitate, seta M absent, seta B7 absent on tibio­ apical vesicle (trilobated in the new species and simple in tarsus III. Femora I, II and III with 12, 11 and 10 setae, B. victoriensis), in the number of setae on femora I, II and trochanters I, II and III with 5, 5 and 4 setae, coxae I, II III (12, 11 and 10 in the new species and 13, 12 and 11 in and III with 3, 6 and 7 setae, subcoxae “2” I, II and III B. victoriensis), and in the presence of two long setae with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, 2 curved at the tip on the tibiotarsi in B. victoriensis. and 2 setae, respectively. Even anal valves each with Brachystomella mauriesi Thibaud & Massoud, 1983 three setae hr. Remarks. This species has the maxilla typical for the Brachystomellapefauri sp. n. genus (not as in Thibaud & Massoud, 1983: Fig. 1B); Figs 40-51 however, the distal tooth is very prominent. The entire Diagnosis. Habitus and buccal cone typical for the type material is badly preserved and therefore we are genus Brachystomella. Postantennal organ with 7 unable to comment more extensively. vesicles. 8+8 eyes present. Very short ordinary setae, for­ Brachystomella minimucronata Palacios-Vargas & Najt, mula of sensory setae s per half tergum: 022/21111. Head 1981 with setae a0, c3 and c5. Thoracic tergum I with 2+2 Remarks. Sensory organ of antennal segment III with setae. Furca well developed with 5 setae on each dens. two guard setae between guard sensilla. Tibiotarsi I, II Mucro straight with apex slightly hooked. Tibiotarsi I, II and III with 18, 18 and 17 setae, respectively, of which 3, and III with 19, 19 and 18 setae, respectively, with seta M 4 and 4 capitate (not 4, 4 and 4 as in the original descrip­ present. Subcoxae “2” I, II and III with 0, 2 and 2 setae, tion by Palacios-Vargas & Najt, 1981); A1, A7, T2 capi­ respectively. Even anal valves each without setae hr. tate on tibiotarsus I, setae A1, A2, A7, T2 capitate on tibi­ Description. Holotype (female) length 1.19 mm, para­ otarsi II and III, seta M absent, seta B7 absent on tibio­ types (females) length 0.83-1.49 mm. Colour in alcohol tarsus III. Femora I, II and III with 12, 11 and 10 setae, bluish-grey, ocular plate blue-black. trochanters I, II and III with 5, 5 and 4 setae, coxae I, II Antennae shorter than head (about 3/4 length of head). and III with 3, 6 and 7 setae, subcoxae “2” I, II and III Antennal segment I with 7 setae, antennal segment II with with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, 2 12 setae. Antennae III and IV fused dorsally, ventral and 2 setae, respectively. Even anal valves each with separation well marked. Sensory organ of antennal seg­ three setae hr. ment III consisting of: two small globular internal sensilla, two subcylindrical guard sensilla (both of the Brachystomella montebella Najt & Palacios-Vargas, same size) and two guard setae between them; ventral 1986 microsensillum present. Antennal segment IV with ordi­ Remarks. Sensory organ of antennal segment III with nary setae and 6 subcylindrical sensilla; dorsoexternal two guard setae between guard sensilla, ventral sensillum microsensillum, subapical organite present; apical vesicle longer than dorsal one. Tibiotarsi I, II and III with 19, 19 slightly trilobated, ventral side with a few truncated setae and 18 setae, respectively (not 18, 18 and 17 as in the (Fig. 41). original description by Najt & Palacios-Vargas, 1986); Postantennal organ (Fig. 42) about 3 times larger than seta M present, seta B7 absent on tibiotarsus III. Femora ocellus, bearing 7 vesicles. Eyes 8+8. Buccal cone typical I, II and III with 12, 11 and 9 setae, trochanters I, II and for the genus. Mandible absent, maxillae each with 8 III with 5, 5 and 4 setae, coxae I, II and III with 3, 6 and 7 teeth (Fig. 43). Labral chaetotaxy: 2/2334. setae, subcoxae “2” I, II and III with 0, 2 and 2 setae, sub­ Dorsal chaetotaxy as in Fig. 40 with very short ordinary coxae “1” I, II and III with 1, 2 and 2 setae, respectively. setae, with longer sensory setae s. Their formula per half Even anal valves each with one seta hr. tergum: 022/21111. Microsensilla on thoracic tergum II Brachystomella nana Rubio & Najt, 1979 present. Head with setae a0, c3 and c5. Thoracic tergum I Remarks. Sensory organ of antennal segment III with with 2+2 setae. Abdominal terga I-IV with seta s = p3. two guard setae between guard sensilla. Tibiotarsi I, II Thoracic sterna without setae. Ventral tube with 3+3 and III with 19, 19 and 18 setae, respectively (not 15, 15

398 Figs 40-51. Brachystomella pefauri sp. n. 40 - dorsal chaetotaxy (scale 0.1 mm); 41 - antennal segments III and IV, dorsal and ventral views (scale 0.05 mm); 42 - postantennal organ and eyes (scale 0.05 mm); 43 - maxillum (scale 0.05 mm); 44 - tibiotarsus III (scale 0.05 mm); 45 - dens and mucro (scale 0.05 mm). setae, abdominal sternum I without setae, abdominal Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ sternum II with 1+1 setae. tively, with acuminate distal setae, seta M present. Furca well developed with 5 setae on each dens (Fig. Femora I, II and III with 12, 11 and 10 setae, trochanters 45). Mucro straight with apex slightly hooked. Ratio I, II and III with 5, 5 and 4 setae, coxae I, II and III with mucro : dens = 1 : 2.25. Tenaculum with 3+3 teeth. Males 3, 6 and 7 setae, subcoxae “2” I, II and III with 0, 2 and 2 unknown. The even anal valves each without setae hr. setae, subcoxae “1” I, II and III with 1, 2 and 2 setae,

399 respectively. Claw with inner tooth at half length of its for the genus. Mandible absent, maxilla with 6 teeth (Fig. inner edge, with a pair of lateral teeth (Fig. 44). Empodial 49) . Labral chaetotaxy: 2/2334. appendage absent. Dorsal chaetotaxy as in Fig. 46 with short ordinary Type material. Holotype 2 in MNHN, paratypes 4 2 2 and 1 setae, with longer sensory setae s. Their formula per half juvenile in MNHN; 1 2 in ISEA. tergum: 022/21111. Microsensilla present on thoracic Type locality. Venezuela, Mérida, La Parroquia, 1,100 m tergum II. Head with setae a0, c3 and c5, setae d5 and sd1 a.s.l., soil in a private garden, ll.v.1980, lgt. J. Péfaur. absent. Thoracic tergum I with 2+2 setae. Abdominal Etymology. The new species is cordially dedicated to J. terga I-IV with setae s = p3. Thoracic sterna without Péfaur, Professor at the University of “Los Andes” in Mérida setae. Ventral tube with 3+3 setae, abdominal sternum I (Venezuela), who kindly collected the material for us. without setae, abdominal sternum II with 1+1 setae. Discussion. The new species is most similar to two spe­ cies: B. saladaensis sp. n. and B. taxcoana Palacios & Furca well developed with 5 setae on each dens (Fig. Najt, 1981 (see discussionin B. saladaensis sp. n.). 51). Mucro straight. Ratio mucro : dens = 1 : 1.95. Tenaculum with 3+3 teeth. Males unknown. Even anal Brachystomellaplatensis Najt & Massoud, 1974 valves each with one seta hr. Remarks. Sensory organ of antennal segment III with Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ two guard setae between guard sensilla. Tibiotarsi I, II tively, with acuminate distal setae, with seta M present and III with 19, 19 and 18 setae, respectively, of which 3, between setae B4 and B5, seta B7 absent on tibiotarsus 4 and 4 capitate (not 3, 3 and 3 as in the original descrip­ III. Femora I, II and III with 12, 11 and 10 setae, respec­ tion by Najt & Massoud, 1974), seta M present, seta B7 tively, trochanters I, II and III with 5, 5 and 4 setae, coxae absent on tibiotarsus III. Setae A1, A2 and A7 slightly I, II and III with 3, 6 and 7 setae, subcoxae “2” I, II and capitate on tibiotarsus I, setae A1, A2, A7 and T2 slightly III with 0, 1 and 1 setae, subcoxae “1” I, II and III with 1, capitate on tibiotarsi II and III. Femora I, II and III with 2 and 2 setae, respectively. Claw with inner tooth in the 12, 11 and 10 setae, trochanters I, II and III with 5, 5 and middle of its inner edge, with a pair of lateral teeth (Fig. 4 setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae 50) . Empodial appendage absent. “2” I, II and III with 0, 2 and 2 setae, subcoxae “1” I, II Type material. Holotype l in MNHN, paratypes l and 2 and III with 1, 2 and 2 setae, respectively. Even anal juveniles in MNHN, l and 1juvenile in ISEA. valves each with two setae hr. Type locality. Peru, Estiron, Rio Ampiyacu, soil in secondary forest (“purma”) o f 9 years, xii.1983, lgt. Ch. Amedegnato & S. Brachystomellapurma sp. n. Poulain. Figs 46-51 Other material. Peru, Estiron, Rio Ampiyacu, litter of secon­ Diagnosis. Habitus and buccal cone typical for the dary forest of over 30 years, i.1984, lgt. Ch. Amedegnato & S. genus Brachystomella. Postantennal organ with four vesi­ Poulain, 5 specimens. cles. 8+8 eyes present. Very short ordinary setae, formula Etymology. The name o f the new species is derived from the name for secondary forest - “purma”. of sensory setae s per half tergum: 022/21111. Head with Discussion. The new species is closest to B. agrosa setae a0, c3 and c5, setae d5 and sd1 absent. Thoracic Wray, 1953 described from Puerto Rico. They possess the sterna without setae. Furca well developed with 5 setae same number of vesicles in postantennal organ (4), the on each dens. Mucro straight. Tibiotarsi I, II and III with same number of setae on thoracic tergum I (2+2), the 19, 19 and 18 setae, respectively, with seta M almost in same number of setae on the dens (5), the same sensillar row B. Subcoxa “2” I, II and III with 0, 1 and 1 seta formula (022/21111), the same number of setae on tibio­ respectively. Even anal valves each with one seta hr each. tarsi I, II and III (19, 19 and 18) and seta a0 on the head. Description. Holotype (female) length 0.47 mm, para­ The two species differ in the shape of the apical vesicle types (females) length 0.51-0.65 mm, paratypes on antennal segment IV (simple in B. agrosa and trilo­ (juvenile) length 0.37-47 mm, other females 0.51-0.78 bated in the new species), in the number of setae hr (two mm. Colour in alcohol bluish-grey, ocular plate blue- setae in B. agrosa and one seta in the new species), and in black. Entire body coarsely granulated. size (1-1.5 mm for B. agrosa and 0.47-0.65 mm for the Antennae shorter than head (more than 3/4 length of new species). head). Antennal segment I with 7 setae, antennal segment II with 12 setae. Antennae III and IV fused dorsally, ven­ Brachystomella ronderosi Najt, 1973 tral separation well marked. Sensory organ of antennal Remarks. Sensory organ of antennal segment III with segment III consisting of: two small curved internal sen­ two guard setae between guard sensilla, dorsolateral sen- silla, two subcylindrical guard sensilla (dorsolateral sen- sillum somewhat shorter than ventrolateral one. Tibiotarsi sillum shorter than ventrolateral one) and two guard setae I, II and III with 19, 19 and 18 setae, respectively; setae between them; ventral microsensillum present. Antennal A1, A2, A4, A5, A7, B4 and B5 slightly capitate; seta M segment IV with ordinary setae, with 6 distinct subcylin­ present, seta B7 absent on tibiotarsus III. Femora I, II and drical sensilla; dorsoexternal microsensillum, subapical III with 13, 12 and 11 setae, trochanters I, II and III with organite present; apical vesicle trilobated, ventral side 6, 6 and 6 setae, coxae I, II and III with 3, 6 and 7 setae, with a few blunt setae (Fig. 47). subcoxae “2” I, II and III with 0, 2 and 2 setae, subcoxae Postantennal organ (Fig. 48) almost 2.4 times larger “1” I, II and III with 1, 3 and 3 setae, respectively. Chae­ than ocellus B, bearing 4 vesicles (2 anterior vesicles totaxy of abdominal tergum V with a1 and p1 (not as in larger than posterior ones). Eyes 8+8. Buccal cone typical

400 Figs 46-51. Brachystomella purma sp. n. 46 - dorsal chaetotaxy (scale 0.1 mm); 47 - antennal segments III and IV, dorsal and ventral views (scale 0.05 mm); 48 - postantennal organ and eyes (scale 0.05 mm); 49 - maxillum (scale 0.05 mm); 50 - tibiotarsus III (scale 0.05 mm); 51 - dens and mucro (scale 0.05 mm).

Fig. 13 in Weiner & Najt, 1997). Even anal valves each Diagnosis. Habitus and buccal cone typical for the with three setae hr. genus Brachystomella. Postantennal organ with 6 Brachystomella saladaensis sp. n. vesicles. 8+8 eyes present. Very short ordinary setae, for­ mula of sensory setae s per half tergum: 022/21111. Head Figs 52-58 with setae a0, c3 and c5, sd1 absent. Thoracic tergum I

401 Figs 52-58. Brachystomella saladaensis sp. n. 52 - dorsal chaetotaxy (scale 0.1 mm); 53 - antennal segments III and IV, dorsal and ventral views (scale 0.05 mm); 54 - maxillum (scale 0.05 mm); 55 - postantennal organ and eyes (scale 0.05 mm); 56 - tibio- tarsus I (scale 0.05 mm); 57 - dens and mucro (scale 0.05 mm); 58 - male genital plate (scale 0.05 mm). with 2+2 setae. Furca well developed with 5 setae on Description. Holotype (female) length 1.07 mm, para- each dens. Mucro straight with apex slightly hooked. types (females) length 0.81-1.16 mm, paratypes (males) Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ length 0.67-0.86 mm. Colour in alcohol bluish-grey, tively, with seta M. Subcoxae “2” I, II and III with 0, 2 ocular plate blue- black. Entire body moderately granu­ and 2 setae, respectively. Even anal valves each with two lated. setae hr. Antennae shorter than head (about 3/4 length of head). Antennal segment I with 7 setae, antennal segment II with

402 12 setae. Antennae III and IV fused dorsally, ventral Diagnosis. Habitus and buccal cone typical for the separation well marked. Sensory organ of antennal seg­ genus Brachystomella. Postantennal organ with five vesi­ ment III consisting of: two small globular internal cles. 7+7 eyes present. Very short ordinary setae, formula sensilla, two subcylindrical guard sensilla (dorsolateral of sensory setae s per half tergum: 022/21111. Head sensillum somewhat shorter than ventrolateral one) and without setae a0, sd1 and sd4, setae c3 and c5, one medial two guard setae between them; ventral microsensillum seta dx present. Thoracic tergum with 2+2 setae. Furca present. Antennal segment IV with ordinary setae and 6 well developed with 5 setae on each dens. Mucro straight distinct subcylindrical sensilla; dorsoexternal microsensil­ with apex slightly hooked. Tibiotarsi I, II and III with 19, lum, subapical organite present; apical vesicle trilobated, 19 and 18 setae, respectively, with seta M almost in row ventral side with a few blunt setae (Fig. 53). B. Subcoxae “2” I, II and III with 0, 2 and 2 setae, respec­ Postantennal organ (Fig. 55) 2.5 times larger than ocel­ tively. Even anal valves each with two setae hr. lus, bearing 6 vesicles. Eyes 8+8. Buccal cone typical for Redescription. Antennae shorter than head (about 3/4 the genus. Mandible absent, maxilla with 7 teeth (Fig. length ofhead). Antennal segment I with 7 setae, antennal 54). Labral chaetotaxy: 2/2334. segment II with 12 setae. Antennae III and IV fused dor­ Dorsal chaetotaxy as in Fig. 52 with very short ordinary sally, ventral separation well marked. Sensory organ of setae, with longer sensory setae s. Their formula per half antennal segment III consisting of: two small globular tergum: 022/21111. Microsensilla present on thoracic internal sensilla, two subcylindrical guard sensilla (dorso­ tergum II. Head with setae a0, c3 and c5, setae sd1 lateral sensillum shorter than ventrolateral one) and two absent. Thoracic tergum I with 2+2 setae. Abdominal guard setae between them; ventral microsensillum terga I-IV with setae s = p3. Thoracic sterna without present. Antennal segment IV with rather short ordinary setae. Ventral tube with 3+3 setae, abdominal sternum I setae, with 5 distinct subcylindrical sensilla; dorsoex­ without setae, abdominal sternum II with 1+1 setae. ternal microsensillum present, truncated subapical Furca well developed with 5 setae on each dens (Fig. organite present; apical vesicle simple, ventral side with a 57) . Mucro straight with apex slightly hooked. Ratio few blunt setae (Fig. 62). mucro : dens = 1 : 2.6. Tenaculum with 3+3 teeth. Males Postantennal organ (Fig. 60) almost three times larger with secondary sexual characters on genital papilla (Fig. than ocellus B, bearing 5 vesicles. Eyes 7+7, ocellus H 58) . Even anal valves each with two setae hr. absent. Buccal cone typical for the genus. Mandible Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ absent, maxilla with 8 teeth (Fig. 61). Labral chaetotaxy: tively, acuminate distal setae, with seta M present, seta 2/2334. B7 absent on tibiotarsus III. Femora I, II and III with 12, Dorsal chaetotaxy as in Fig. 59 with very short ordinary 11 and 10 setae, trochanters I, II and III with 5, 5 and 4 setae, with longer sensory setae s. Their formula per half setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae tergum: 022/21111. Microsensilla present on thoracic “2” I, II and III with 0, 2 and 2 setae, subcoxae “1” I, II tergum II. Head without setae a0, sd1 and sd4, setae c3 and III with 1, 2 and 2 setae, respectively. Claw with and c5, one medial seta dx present. Thoracic tergum I inner tooth at 1/3 length of its inner edge, with pair of lat­ with 2+2 setae. Abdominal terga I-IV with seta s = p3. eral teeth (Fig. 56). Empodial appendage absent. Thoracic sterna without setae. Ventral tube with 3+3 Type material. Holotype 2 in MNHN, paratypes 1 k and 6 setae, abdominal sternum I without setae, abdominal 2 2 in MNHN; 1juvenile 2 and 3 2 2 in ISEA. sternum II with 1+1 setae. Type locality. Argentina, Chascomus, province of Buenos Furca well developed with 5 setae on each dens (Fig. Aires, litter on the shore o f lake Salada Grande,12.viii.1968, lgt. 64). Mucro straight with apex slightly hooked. Ratio J. Snack & L. Bulla. mucro : dens = 1 : 2.2. Tenaculum with 3+3 teeth. Males Etymology. The name of new species is derived from the type locality. unknown. Even anal valves each with two setae hr. Discussion. The new species shares some characters Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ with B. taxcoana Palacios-Vargas & Najt, 1981. Both tively, with acuminate distal seta; seta M between setae have the same number of setae on the head, including seta B4 and B5, seta B7 absent on tibiotarsus III. Femora I, II a0, the same number of setae on the dens (5), the same and III with 12, 11 and 10 setae, trochanters I, II and III number of setae on tibiotarsi (19, 19 and 18) and the with 5, 5 and 4 setae, coxae I, II and III with 3, 6 and 7 apical vesicle on antennal segment IV is trilobated. They setae, subcoxae “2” I, II and III with 0, 2 and 2 setae, sub­ differ in the number of setae hr on the even anal valves (3 coxae “1” I, II and III with 1, 2 and 2 setae, respectively. in B. taxcoana, 2 in B. saladaensis), in the ratio mucro : Claw with inner tooth at 1/3 length of its inner edge, with dens (1 : 2.12 in B. taxcoana and 1 : 2.6 in the new spe­ pair oflateral teeth (Fig. 63). Empodial appendage absent. cies), in the size of guard sensilla in the sensory organ of Type material. Not present in the collection of Laboratoire d’Entomologie, MNHN in Paris. antennal segment III (long sensilla in B. taxcoana, with Type locality. Costa Rica, Tuis, xi. 1912, lgt. J.Fig. Tristan ventrolateral sensillum somewhat longer than the guard (Denis: 1931). seta and short in the new species, with ventrolateral sen­ Other locality. Costa Rica, La Palma, xi.1931. lgt. J.Fig. sillum shorter than the guard seta). Tristan, 3 specimens, Mexico, Veracruz, Teocelo, forest litter, Brachystomella septemoculata Denis, 1931 8.vi.1985, lgt. J. Boudinot, 6 specimens. Discussion. Of the species of Brachystomella, without Figs 59-64 seta a0 on the head and with 5 setae on the dens, Brachys-

403 Figs 59-64. Brachystomella septemoculata Denis, 1931. 59 - dorsal chaetotaxy (scale 0.1 mm); 60 - postantennal organ and eyes (scale 0.05 mm); 61 - maxillum (scale 0.05 mm); 62 - antennal segments III and IV (scale 0.05 mm); 63 - tibiotarsus I (scale 0.05 mm); 64 - dens and mucro (scale 0.05 mm). tomella septemoculata is closest to Brachystomella con­Brachystomella stachi Mills, 1934 torta, described also from Costa Rica. The two species Remarks. Sensory organ of antennal segment III with differ in the number of eyes (7+7 in B. septemoculata and two guard setae between guard sensilla, dorsolateral sen- 8+8 in B. contorta) and in the shape of the mucro sillum shorter than ventrolateral one. Tibiotarsi I, II and (straight with apex slightly hooked inB. septemoculata III with 18, 18 and 17 setae, respectively; seta M absent, and bent in B. contorta). seta B7 absent on tibiotarsus III. Femora I, II and III with 11, 11 and 10 setae, trochanters I, II and III with 5, 5 and

404 4 setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae racic tergum I with 4+4 setae. Abdominal terga I-IV with “1” I, II and III with 0, 2 and 2 setae, subcoxae “2” I, II setae s = p4. Thoracic sterna without setae. Ventral tube and III with 1, 2 and 2 setae, respectively. Even anal with 3+3 setae, abdominal sternum I without setae, valves each with three setae hr. abdominal sternum II with 3+3 setae. Brachystomella taxcoana Palacios-Vargas & Najt, 1981 Furca well developed with 6 setae on each dens (Fig. 70). Mucro straight with apex slightly hooked. Ratio Remarks. Sensory organ of antennal segment III with mucro : dens = 1 : 1.7. Tenaculum with 3+3 teeth. Males two guard setae between guard sensilla, dorsolateral sen- unknown. Even anal valves each with two setae hr. sillum shorter than ventrolateral one. Tibiotarsi I, II and Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ III with 19, 19 and 18 setae, respectively; seta M present, tively, with seta M present, seta B7 absent on tibiotarsus seta B7 absent on tibiotarsus III. Femora I, II and III with III. All setae in row A, T and setae B2- B7 and M bent 12, 11 and 10 setae, trochanters I, II and III with 5, 5 and and slightly capitate. Seta B1 straight and acuminate. 4 setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae Femora I, II and III with 12, 12 and 10 setae, trochanters “1” I, II and III with 0, 2 and 2 setae, subcoxae “2” I, II I, II and III with 6, 6 and 5 setae, coxae I, II and III with and III with 1, 2 and 2 setae, respectively. Even anal 3, 6 and 7 setae, subcoxae “2” I, II and III with 0, 2 and 2 valves each with three setae hr. setae, subcoxae “1” I, II and III with 1, 3-4 and 3-4 Brachystomella tuberculata (Wahlgren, 1906) setae, respectively. Claw with inner tooth at 1/3 length of Chondrachorutes tuberculatus Wahlgren, 1906 its inner edge, with pair of lateral, strong teeth (Fig. 69). Figs 65-70 Empodial appendage absent. Diagnosis. Habitus and buccal cone typical for the Type material. Lectotype 2, paralectotype in alcohol pres­ genus Brachystomella. Postantennal organ with four vesi­ ently designated, in Natur historiska Riksmuseet (Stockholm, Sweden). cles. 8+8 eyes present. Strong ordinary setae, formula of Type locality. Falklands Is., Murray Heigths near Port Stan­ sensory setae s per half tergum: 022/21111. Head without ley, 22.ii.1902, lgt. Svenska Sydpolsexped. seta a0, setae c1 and c5 present. Thoracic tergum I with Discussion. Brachystomella tuberculata is quite excep­ 4+4 setae. Furca well developed with 6 setae on each tional among the species from the Neotropical region; it dens. Mucro straight with apex slightly hooked. Tibiotarsi differs in the presence of 4+4 setae on thoracic tergum I I, II and III with 19, 19 and 18 setae, respectively, with and the number of setae on subcoxae A “1” II and III seta M. All setae in rows A, T; setae B2-B7 and M (3-4). It shares the first character with four species from slightly bent and slightly capitate. Seta B1 straight and the Australian region: B. ultima Greenslade & Najt, 1987, acuminate. Subcoxae “2” I, II and III with 1, 3-4 and 3-4 B. disputa Greenslade & Najt, 1987, B. solidaria setae, respectively. Even anal valves each with two setae Greenslade & Najt, 1987, B. dianae Greenslade & Najt, hr. 1987 and with one species from the South African region: Redescription. Colour in alcohol (at present) violet B. coatsi Weiner & Najt, 1991. Four of them (excluding with lighter antennae, legs and ventral side, and ocular B. ultima) differ from B. tuberculata in the absence of plate black (in original description: “Farbe dunkelblau. seta a2 on thoracic tergum III (present in B. tuberculata Die helle Grundfarbe leucht in zwei unvollständigen and B. ultima). B. tuberculata and B. ultima differ in the Längsbändern, die auf dem Kopfe winkelig zusammensti- number of vesicles in the postantennal organ (4 in B. essen, hervor. Augenflecke schwarz. Unterseite und tuberculata and 7-8 in B. ultima), in the presence of: Beine lichter.”). Entire body strongly granulated. setae from m-row of thoracic segments II and III in B. Antennae shorter than head (about 2/3 length of head). ultima (absent in B. tuberculata), long, bent and slightly Antennal segment I with 7 setae, antennal segment II with capitate setae on tibiotarsi I-III and a pair of lateral teeth 12 setae. Antennae III and IV fused dorsally, ventral on the claw (the last two characters absent in B. ultima). separation well marked. Sensory organ of antennal seg­ ment III consisting of: two small globular, slightly bent Brachystomella victoriensis Izarra, 1972 internal sensilla, two subcylindrical guard sensilla (dorso­ Figs 71-76 lateral sensillum somewhat shorter than ventrolateral one) Diagnosis. Habitus and buccal cone typical for the and two guard setae between them; ventral microsen- genus Brachystomella. Postantennal organ with four vesi­ sillum present. Antennal segment IV with long ordinary cles. 8+8 eyes present. Short ordinary setae, very long setae and 6 indistinct sensilla; dorsoexternal microsensil- setae s, their formula per half tergum: 022/21111. Head lum, subapical organite present; apical vesicle fairly sim­ with setae a0, c3 and c5. Thoracic tergum with 3+3 setae. ple, ventral side with a few blunt setae (Fig. 67). Furca well developed with 7 setae on each dens. Mucro Postantennal organ (Fig. 68) 2.5 times larger than ocel­ straight with apex slightly hooked. Tibiotarsi I, II and III lus, bearing four vesicles. Eyes 8+8. Buccal cone typical with 19, 19 and 18 setae, respectively, with short seta M for the genus. Mandible absent, maxilla with 6 teeth (Fig. and long setae B4 and B5, curved at tips. Subcoxae “2” I, 66). Labral chaetotaxy: 2/2334. II and III with 0, 2 and 2 setae, respectively. Even anal Dorsal chaetotaxy as in Fig. 65 with very strong ordi­ valves each with three setae hr. nary setae, with longer sensory setae s. Their formula per Redescription. Antennae as long as head. Antennal half tergum: 022/21111. Microsensilla on thoracic tergum segment I with 7 setae, antennal segment II with 12 setae. II present. Head with setae a0, c1 and c5 present. Tho­ Antennae III and IV fused dorsally, ventral separation

405 Figs 65-70.Brachystomella tuberculata (Wahlgren, 1906). 65 - dorsal chaetotaxy, ordinary seta and sensory seta (scale 0.1 mm); 66 - maxillum (scale 0.1 mm); 67 - antennal segments III and IV, dorsolateral view (scale 0.1 mm); 68 - postantennal organ and eyes (scale 0.1 mm); 69 - tibiotarsus I (scale 0.1 mm); 70 - dens, mucro and tenaculum (scale 0.1 mm). well marked. Sensory organ of antennal segment III cal organite present; apical vesicle trilobated in deep cav­ consisting of: two small globular internal sensilla, two ity, ventral side with a few truncated setae (Fig. 72). subcylindrical guard sensilla (dorsolateral sensillum Postantennal organ (Fig. 74) almost 1.4 times larger somewhat shorter than ventrolateral one) and two guard than ocellus B, bearing 4 vesicles. Eyes 8+8. Buccal cone setae between them; ventral microsensillum present. typical for the genus. Mandible absent, maxilla with 6 Antennal segment IV with rather long ordinary setae, teeth (Fig. 73). Labral chaetotaxy: 2/2334. with 6 only slightly distinct, long subcylindrical sensilla; Dorsal chaetotaxy as in Fig. 71 with very short ordinary dorsoexternal microsensillum present, truncated subapi- setae, with sensory setae s longer than the latter. Their

406 Figs 71-76.Brachystomella victoriensis Izarra, 1972. 71 - dorsal chaetotaxy (scale 0.1 mm); 72 - antennal segments III and IV, dorsal and ventral views (scale 0.05 mm); 73 - maxillum (scale 0.05 mm); 74 - postantennal organ and eyes (scale 0.05 mm); 75 - tibiotarsus III (scale 0.05 mm); 76 - dens and mucro (scale 0.05 mm). formula per half tergum: 022/21111. Microsensilla pre­ 3+3 setae, abdominal sternum I without setae, abdominal sent on thoracic tergum II. Head with setae a0, setae c3 sternum II with 1+1 setae. and c5, sometimes asymmetrical seta sd present. Thoracic Furca well developed with 6 setae on each dens (Fig. tergum I with 3+3 setae. Abdominal terga I-IV with seta 76). Mucro straight with apex slightly hooked. Ratio s = p4. Thoracic sterna without setae. Ventral tube with mucro : dens = 1 : 2.72. Tenaculum with 3+3 teeth. Males

407 with secondary sexual characters: genital plate with 4+4 Dorsal chaetotaxy as in Fig. 77 with mesochaetae and stout setae near aperture. Even anal valves each with serrated macrochaetae, with long sensory setae s. Their three setae hr. formula per half tergum: 022/21111. Microsensilla on Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ thoracic tergum II present. Head with seta a0, setae c2 tively, with acuminate distal seta; short seta M between and c5 present. Thoracic tergum I with 3+3 setae. long setae B4 and B5, curved at the tip; seta B7 absent on Abdominal terga I-III with seta s = p4, abdominal tergum tibiotarsus III. Femora I, II and III with 13, 12 and 11 IV with seta s = p3. Thoracic sterna without setae. Ven­ setae, trochanters I, II and III with 6, 6, and 6 setae, coxae tral tube with 3+3 setae, abdominal sternum II with 1+1 I, II and III with 3, 6 and 7 setae, subcoxae “2” I, II and setae. III with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, Reduced furca with 3 setae on each dens (Fig. 82). 2 and 2 setae, respectively. Claw with inner tooth at 1/3 Mucro with apex slightly hooked. Ratio mucro : dens = 1 length of its inner edge, and a pair of lateral teeth (Fig. : 2.75. Tenaculum with 3+3 teeth. Males with secondary 75). Empodial appendage absent. sexual characters on genital papilla (Fig. 83). The even Type material. Holotype k (juvenile), paratypes 2 k k in anal valves each with three setae hr. Museo de La Plata, Argentina. Tibiotarsi I, II and III with 18, 18 and 17 setae, respec­ Type locality. Argentina, Isla Victoria, in moss, 29.vii.1970, tively, of which 2, 3 and 3 capitate setae; seta M absent, lgt. D. Izarra. seta B7 absent on tibiotarsus III. Setae A1 and A7 capi­ Discussion. Brachystomella victoriensis shares some tate on tibiotarsus I and setae A1, A2 and A7 capitate on characters withB. mataraniensis sp. n. They possess seta tibiotarsi II and III. Femora I, II and III with 12, 11 and a0 on the head and the same number of setae : on thoracic 10 setae, trochanters I, II and III with 5, 5, 4 setae, coxae tergum I (3+3), the dens (6), and tibiotarsi (19, 19, 18), as I, II and III with 3, 6-7 and 7 setae, subcoxae “2” I, II and well as the same number of setae hr on each even valve III with 0, 2 and 2 setae, subcoxae “1” I, II and III with 1, (3). The apical vesicle on antennal segment IV is simple 1-2 and 1-2 setae, respectively. Claw with inner tooth at in B. mataraniensis and trilobated in B. victoriensis. They half length of its inner edge, with pair oflateral teeth (Fig. differ also in the number of setae on femora I, II and III 81). Empodial appendage absent. (12, 11 and 10 in Brachystomella mataraniensis sp. n. Type material. Lectotype k, paralectotypes k and 2 pres­ and 13, 12 and 11 in B. victoriensis) and on trochanters ently designated, in MNHN. (5, 5 and 4 in Brachystomella mataraniensis sp. n. and 6, Type locality. Brasil, Recife, Rio Dolce, 19.v.1959, lgt. Cl. 6 and 6 in B. victoriensis). Delamare Deboutteville & E. H. Rapoport. Brachystomella villalobosi Cassagnau & Rapoport, 1962 Discussion. Brachystomella villalobosi Cassagnau & Rapoport, 1962 is closest to B. barrerai Palacios-Vargas Figs 77-83 & Najt, 1981. They share the same number of the setae on Diagnosis. Habitus and buccal cone typical for the the dens (3) , the same shape of mucro and of apical vesi­ genus Brachystomella. Postantennal organ with 4 (3) cle. They differ in the number of the capitate setae on the vesicles. 8+8 eyes present. Very short ordinary setae, tibiotarsus III (2, 3 and 3 in B. villalobosi and 3, 4 and 4 some capitate setae on the last abdominal terga, formula in B. barrerai), in the number of the setae hr on even anal of sensory setae s per half tergum: 022/21111. Head with valves (2 in B. villalobosi and 3 in B. barrerai). seta a0, setae c2 and c5 present. Thoracic tergum I with 3+3 setae. Reduced furca with 3 setae on each dens. Brachystomella zapatai Najt & Palacios-Vargas, 1986 Mucro present. Tibiotarsi I, II and III with 18, 18 and 17 Remarks. Sensory organ of antennal segment III with setae, respectively, of which 2, 3 and 3 capitate, without two guard setae between guard sensilla. Formula of sen­ seta M. Subcoxae “2” I, II and III with 0, 2 and 2 setae, sory setae s per half tergum: 022/11111. Tibiotarsi I, II respectively. Even anal valves each with three setae hr. and III with 18, 18 and 17 setae, respectively; seta M Redescription. Antennae shorter than head (about 3/4 absent, seta B7 absent on tibiotarsus III. Femora I, II and length ofhead). Antennal segment I with 7 setae, antennal III with 12, 11 and 10 setae, trochanters I, II and III with segment II with 12 setae. Antennae III and IV fused dor­ 5, 5 and 4 setae, coxae I, II and III with 3, 6 and 7 setae, sally, ventral separation well marked. Sensory organ of subcoxae “2” I, II and III with 0, 2 and 2 setae, subcoxae antennal segment III consisting of: two small globular “1” I, II and III with 1, 2 and 2 setae, respectively. Even internal sensilla, two subcylindrical guard sensilla (dorso­ anal valves each with three setae hr. lateral sensillum shorter than ventrolateral one) and two Brachystomella zerpa sp. n. guard seta between them; ventral microsensillum present. Antennal segment IV with rather long ordinary setae, Figs 84-89 with 6 slightly distinct subcylindrical sensilla; dorsoex- Diagnosis. Habitus and buccal cone typical for the ternal microsensillum present, truncated subapical genus Brachystomella. Postantennal organ with 5 organite present; apical vesicle slightly bilobated in deep vesicles. 5+5 eyes present. Very short ordinary setae, for­ cavity, ventral side with a few truncated setae (Fig. 79). mula of sensory setae s per half tergum: 022/21111. Head Postantennal organ (Fig. 80) almost as large as ocellus without setae a0 and sd1, setae c2 and c5 present. Tho­ B, bearing 4 (3) vesicles. Eyes 8+8. Buccal cone typical racic tergum I with 2+2 setae. Furca well developed with for the genus. Mandible absent, maxilla with 6 teeth (Fig. 5 setae on each dens. Mucro straight with apex slightly 78). Labral chaetotaxy: 2/2334. hooked. Tibiotarsi I, II and III with 19, 19 and 18 setae,

408 Figs 77-83.Brachystomella villalobosi Cassagnau & Rapoport, 1962. 77 - dorsal chaetotaxy (scale 0.1 mm); 78 - maxillum (scale 0.05 mm); 79 - antennal segments III and IV, dorsolateral view (scale 0.05 mm); 80 - postantennal organ and eyes (scale 0.05 mm); 81 - tibiotarsus II (scale 0.05 mm); 82 - dens and mucro (scale 0.05 mm); 83 - male genital plate (scale 0.05 mm). respectively, with seta M almost in row B. Subcoxa “2” I, length 0.67 mm. Colour in alcohol bluish-grey, ocular II and III with 1, 2 and 2 setae, respectively. Even anal plate blue- black. Entire body moderately granulated. valves each with two setae hr. Antennae shorter than head (about 3/4 length of head). Description. Holotype (female) length 0.91 mm, para- Antennal segment I with 7 setae, antennal segment II with types (females) length 0.70-0.95 mm, paratype (juvenile) 12 setae. Antennae III and IV fused dorsally, ventral

409 Figs 84-89.Brachystomella zerpa sp. n. 84 - dorsal chaetotaxy (scale 0.1 mm); 85 - maxillum (scale 0.05 mm); 86 - postan­ tennal organ and eyes (scale 0.05 mm); 87 - antennal segments III and IV, dorsal view (scale 0.05 mm); 88 - dens and mucro (scale 0.05 mm); 89 - tibiotarsus III (scale 0.05 mm). separation well marked. Sensory organ of antennal seg­ microsensillum, subapical organite present; apical vesicle ment III consisting of: two small globular internal trilobated, ventral side with a few blunt setae (Fig. 87). sensilla, two subcylindrical guard sensilla (dorsoventral Postantennal organ (Fig. 86) almost three times larger sensillum shorter than ventrolateral one) and two guard than ocellus B, bearing 5 vesicles. Eyes 5+5. Buccal cone setae between them; ventral microsensillum present. typical for the genus. Mandible absent, maxilla with 8 Antennal segment IV with rather long ordinary setae, teeth (Fig. 85). Labral chaetotaxy: 2/2334. with 6 distinct subcylindrical sensilla; dorsoexternal

410 Dorsal chaetotaxy as in Fig. 84 with very short ordinary - 5+5 eyes present ...... 4 setae, with longer sensory setae s. Their formula per half 3. 6+6 eyes present, postantennal organ with 6 vesicles, dens tergum: 022/21111. Microsensilla present on thoracic with 6 setae ...... B. sexoculata Massoud, 1967 tergum II. Head without setae a0 and sdl, with setae c2 Peru and c5 present. Thoracic tergum I with 2+2 setae. - 7+7 eyes present, postantennal organ with 5 vesicles, dens with5setae ...... B.septemoculata Denis,1931 Abdominal terga I-IV with seta seta s = p3. Thoracic Costa Rica, Jamaica, the French West Indies, Cuba, Mexico sterna lacks setae. Ventral tube with 3+3 setae, abdominal 4. Thoracic tergum I with 2+2 setae, postantennal organ with 5 sternum I without setae, abdominal sternum II with 1+1 vesicles, even anal valves each with 1 o r2 setae h r ...... 5 setae. - Thoracic tergum I with 3+3 setae, postantennal organ with 4 Furca well developed with 5 setae on each dens (Fig. vesicles, apical vesicle on antennal segment IV simple, even 88). Mucro straight with apex slightly hooked. Ratio anal valves each with 3 setae hr ...... mucro : dens = 1 : 2.5. Tenaculum with 3+3 teeth. Males ...... B. chilensis (Rapoport & Rubio, 1963) unknown. Even anal valves each with 2 setae hr (one Chile specimen with 2+3 setae). 5. Head with seta a0, apical vesicle on antennal segment IV sim­ ple, dens with 6 setae, even anal valves each with 1 seta hr Tibiotarsi I, II and III with 19, 19 and 18 setae, respec­ ...... B. montebella Najt & Palacios, 1986 tively, with acuminate distal setae, seta M (= Mexico microchaeta) between setae B4 and B5 present, seta B7 - Head without seta a0, apical vesicle on antennal segment IV absent on tibiotarsus III. Femora I, II and III with 12, 11 trilobated, dens with 5 setae, the even anal valves each with and 10 setae, trochanters I, II and III with 5, 5 and 4 2 setae hr ...... B. zerpa sp. n. setae, coxae I, II and III with 3, 6 and 7 setae, subcoxae Venezuela “2” I, II and III with 1, 2 and 2 setae, subcoxae “1” I, II 6. Tibiotarsi with capitate setae ...... 7 and III with 1, 2 and 2 setae, respectively. Claw with -Tibiotarsiwithoutcapitatesetae ...... 15 inner tooth at 1/3 length of its inner edge, with pair of lat­ 7. Tibiotarsiwith7-16capitatesetae...... 8 - Tibiotarsi with 1-4 capitate setae ...... 9 eral teeth (Fig. 89). Empodial appendage absent. 8. Thoracic tergum I with 4+4 setae, tibiotarsi with about 17-18 Type material. Holotype , paratypes 5 and 1 juvenile 2 2 2 capitate setae, postantennal organ with 4 vesicles ...... in MNHN; 2 2 2 in ISEA...... B.tuberculata Wahlgren,1906 Type locality. Venezuela, Monte Zerpa, 2,400 m a.s.l., cloud Falklands Is. forest, litter, 11.v.1980, lgt. A. Pascual. - Thoracic tergum I with 2+2 setae, tibiotarsi with 7 capitate Etymology. The name of the new species is derived from the setae, postantennal organ with 5-6 vesicles ...... type locality...... B.ronderosi Najt,1973 Discussion. The new species shares withB. montebella Argentina (Tierra del Fuego), Chile (Magallanes Province) Najt & Palacios-Vargas, 1986 and B. chilensis Rapoport 9. Tibiotarsi with 3-4 capitate setae ...... 10 & Rubio, 1963 the same number of eyes (5+5) and the - Tibiotarsi with 1 capitate seta ...... 14 same number of setae on thoracic tergum I (2+2). It dif­ 10. Thoracic tergum I with 3+3 setae, tibiotarsi I, II and III with fers from the first species in the number of setae on tibio­ 18,18and17setae,respectively ...... 11 tarsi (18, 18 and 17 in B. montebella and 19, 19, and 18 in - Thoracic tergum I with 2+2 setae, tibiotarsi I, II and III with the new species), the number of dental setae (6 in B. mon­ 19, 19 and 18 setae, respectively, o f which 3, 4 and 4 are capitate ...... B.platensis Najt&Massoud,1974 tebella and 5 in the new species) and the shape of the Argentina, Australia, Tasmania apical vesicle on antennal segment IV (simple in B. mon­ 11. Dens with 3 setae each, tibiotarsi I, II and III with 2, 3 and 3 tebella and trilobated in the new species). The new spe­ or 3, 4 and 4 capitate setae, even anal valves each with 3 cies is closest to B. chilensis, which has the same number setaehr ...... 12 of tibiotarsal setae and the same sensillar formula. The - Dens with 4 setae each, tibiotarsi I, II and III with 3, 4 and 4 two species differ in the number of dental setae (6 in B. capitate setae each, even anal valves each with 2 setae hr . . chilensis, 5 in the new species), and vesicles in the ...... B. globulosa Cassagnau & Rapoport, 1962 postantennal organ (4 in B. chilensis, 5 in the new Argentina species), in the shape of apical vesicle (simple in B. 12. Tibiotarsi I, II and III with 3, 4 and 4 capitate setae . . . 13 - Tibiotarsi I, II and III with 2, 3 and 3 capitate setae, apical chilensis and trilobated in the new species), and in the vesicle on antennal segment IV slightly trilobated ...... arrangement of eyes (in B. chilensis D, F and H absent, in ...... B. villalobosi Cassagnau & Rapoport, 1962 the new species F, G and H absent). There are also some Brasil, Mexico, USA (Florida) differences in chaetotaxy: B. chilensis has seta a0 on head 13. Mucro about U length o f dens, apical vesicle on antennal and 3+3 setae on thoracic tergum I, and the new species segment IV trilobated ...... has no seta a0 on head, and 2+2 setae on thoracic tergum ...... B. barrerai Palacios-Vargas & Najt, 1981 I. Mexico - Mucro reduced, mamelon-shaped, about 1/4 length o f dens, Key to the species of Agren 1903 from the Brachystomella apical vesicle on antennal segment IV simple ...... Neotropical region* ...... B. minimucronata Palacios-Vargas & Najt, 1981 1. Less than 8+8 eyes present ...... 2 Mexico - 8+8 eyes present ...... 6 14. Apical vesicle on antennal segment IV simple, dens with 4 2. 6-7+6-7 eyes present...... 3 setae ...... B.baconaoensis Gruia,1983

* B. mauriesi Thibaud & Massoud, 1983 is not included in this key.

411 Cuba, USA (Florida), Mexico Galapagos - Apical vesicle on antennal segment IV trilobated, dens with 26. Even anal valves each with 2 setae hr, ratio mucro : dens = 5-6 setae ...... B. neomexicana (Scott, I960) 2.6 ...... B. saladaensis sp. n. USA, (New Mexico, California, Louisiana, Texas, Colorado), Mexico Argentina 15. Postantennal organ with 4 vesicles ...... 16 - Even anal valves each with 3 setae hr, ratio mucro : dens = - Postantennal organ with more than 4 vesicles ...... 22 2.12 ...... B.taxcoana Palacios-Vargas&Najt,1981 16. Thoracic tergum I with 3+3 setae ...... 17 Mexico - Thoracic tergum I with 2+2 setae ...... 18 27. Apical vesicle on antennal segment IV trilobated, straight 17. Apical vesicle on antennal segment IV simple, femora I, II mucro with apex slightly hooked ...... 28 and III with 12, 11 and 10 setae, tibiotarsi with short inner - Apical vesicle on antennal segment IV simple, mucro bent, setae (B4 and B5) ...... B. mataraniensis sp. n. even anal valves each with 2 setae hr ...... Peru ...... B.contorta Denis,1931 - Apical vesicle on antennal segment III trilobated, femora I, II Costa Rica, Jamaica, Malaysia, Cuba, the French West Indies, and III with 13, 12 and 10 setae, tibiotarsi with 2 long inner Hawaii, Galapagos, Mexico, India, the CapeVerde Is., setae (B4 and B5), curved at the tip ...... Philippines, Ivory Coast, Angola ...... B.victoriensis Izarra,1972 28. Even anal valves each without setae hr, subcoxae “2" I, II Argentina and III with O, 2 and 2 setae, respectively ...... 18. Abdominal tergum I with 1+1 sensory setae s, tibiotarsi I, II ...... B.pefauri sp. n. and III with 18,18 and 17 setae...... 19 Venezuela - Abdominal tergum I with 2+2 sensory setae s, tibiotarsi I, II - Even anal valves each with 1 seta hr, subcoxae “2” I, II and III and III with 19,19 and 18 setae ...... 20 with O, 1 and 1 setae, respectively ...... 19. Head with seta a0, apical vesicle on antennal segment IV tri­ ...... B. desutterae sp. n. lobated, dens with 7 setae ...... Peru ...... B. zapatai Najt & Palacios-Vargas, 1986 ACKNOWLEDGEMENTS. We are most grateful to the following Mexico colleagues who supplied us with the materials described in this - Head without seta a0, apical vesicle on antennal segment IV study: Ch. Amedegnato, L. Desutter-Grandcolas and S. Poulain simple,denswith6setae ...... B.stachi Mills,1934 from the Laboratoire d'Entomologie, Muséum national d’His­ USA (Iowa, Connecticut, Florida, Massachusetts, New York, toire naturelle (Paris, France), A. Pascual and J. Péfaur, Indiana, Missouri, North Carolina), the French West Indies, University o f “Los Andes” (Mérida, Venezuela), J. Snack and Mexico, French Guiana, Ecuador L. Bulla, Facultad de Ciencias y Museo de La Plata (Argentina). 20. Abdominal terga II and III with 1+1 sensory setae s, dens We are also grateful to A. Camousseight, Museo National de each with 5 normal setae, even anal valves each with 1 or 2 Historia Natural, (Santiago, Chile), K.A. Christiansen, Grinnell setaehr ...... 21 College (Grinnell, USA), M. Gruia, Institutul de Speologie - Abdominal terga II and III with 2+2 sensory setae s, dens each “Emil Racovitza” (Bucharest, Romania), J.G. Palacios-Vargas, with 6 setae: 3 strong setae and three ordinary ones, even Facultad de Ciencias, UNA (México), Torbjörn Kronestedt, anal valves each with 3 setae hr ...... Naturhistoriska Riksmuseet (Stockholm, Sweden) for loan of ...... B. nana Rubio & Najt, 1979 type material, and H. Strümpel, Zoologisches Institut und Chile Zoologisches Museum, Universität Hamburg (Hamburg, Ger­ 21. Apical vesicle on antennal segment IV simple, even anal many) for information. We express our sincere gratitude to valves each with 2 setae hr each, animals ofb ig size ...... Maria Bieniek for her effective assistance. Finally, we thank the ...... B. agrosa Wray, 1953 two reviewers and the English language editor for valuable Puerto Rico, the French West Indies, Ecuador, Cuba, Brasil, comments to the manuscript. French Guiana - Apical vesicle on antennal segment IV trilobated, even anal The work is supported by grant KBN 6PO4C OO4 14 from the valves each with 1 seta hr, animals o f small size ...... Polish Committee for Research...... B.purma sp. n. Peru REFERENCES 22.HeadwithsetaaO ...... 23 Cassagnau P. & Rapoport E.H. 1962: Collemboles d’Amérique - Head without seta aO ...... 27 du Sud (I). Poduromorphes. Biol. Am. Australe 1: 139-184. 23. Furca well developed, dens with 5-6 setae, mucro present . Gruia M.M. 1983: Collemboles arthropléones de Cuba récoltés ...... 24 par les expéditions cubano-roumaines en 1969-1973. II. - Furca reduced, dens with 3 setae, mucro absent, apical vesicle Result. Expéd. Biospéol. Cubano-Roumaines à 4: Cuba on antennal segment IV simple, postantennal organ with 191-2O5. 7-10 vesicles, even anal valves each with 3 setae hr ...... Hermosilla W. & Rubio I. 1976: Structure des populations de ...... B. cyanea (Rapoport, 1962) Collemboles Poduromorphes dans une colline de la Cordillera Argentina de la Côte Chilienne.Rev. Ecol. Biol. Sol. 13: 477-489. 24. Dens with 5 setae ...... 25 Izarra D.C. 1972: Fauna colembológica de Isla Victoria (Prov. - Dens with 6 setae, apical vesicle on antennal segment IV sim­ Neuquén, Argentina). II. Familia . Physis 31: ple, postantennal organ with 5- 6 vesicles, even anal valves 88-96. each with 3 setae hr ...... Mari Mutt J.A. & Bellinger P.F .199O: A Catalog of the Neo­ ...... B. gabrielae Najt & Palacios-Vargas, 1986 tropical Collembola Including Nearctic Areas o f Mexico. Mexico FloraandFaunaHandbook 5: 1-237. 25. ApicalvesicleonantennalsegmentIVtrilobated ..... 26 Massoud Z. 1967: Monographie des Neanuridae, Collemboles - Apical vesicle on antennal segment IV simple, postantennal Poduromorphes à pièces buccales modifiées. Biol. Am. Austr. organ 6-7 vesicles, even anal valves each with 2 setae hr . . 3: 1-399...... B. grootaerti Najt, Thibaud & Jacquemart, 1991

412 Najt J. & Massoud Z. 1974: Contribution à l’étude des Bra- Palacios -Vargas J.G. & Najt J. 1981: Tres nuevas Brachys- chystomellinae (Insectes, Collemboles). I. Nouvelles espèces tomella (Collembola : Neanuridae) de México. Bull. Soc. récoltées enArgentine. Rev. Ecol. Biol. Sol 11: 367-372. Hist. Nat. Toulouse 117: 263-271. Najt J. & Palacios -Vargas J.G. 1986: Nuevos Brachystomel- Rapoport E.H. & Rubio I. 1963: Fauna collembologica de linae de México (Collembola, Neanuridae). Nouv. Rev. Ento- Chile. Inv. Zool. Chilena 9: 95-124. mol. 1-3: 457-471. Rubio I. & Najt J. 1979: Deux nouvelles espèces de Collem­ Najt J., Thibaud J.-M. & Weiner W.M. 1990: Collemboles boles du Chili. Rev. Ecol. Biol. Sol 16: 131-135. (Insecta) Poduromorphes de Guyane française. Bull. Mus. Thibaud J.-M. & Massoud Z. 1983: Les Collemboles des Petites Natn. Hist. Nat., Paris 12A: 95-121. Antilles III. - Neanuridae (). Rev. Ecol. Najt J., Thibaud J.-M. & Jacquemart S. 1991: Les Collemboles Biol. Sol 20: 111-129. (Insecta) de l ’Archipel des Galápagos. I. Poduromorpha.Bull. Weiner W.M. & Najt J. 1997: Collembola Poduromorpha from Inst. R. Sci. Nat. Belg., Entomol. 61: 149-166. the Magallanes Province (Chile). Bonn. Zool. Beitr. 47: Najt J. & Weiner W.M. 1996: Geographical distribution of Bra- 99-110. chystomellidae (Collembola: Neanuridae). Pan-Pacific Ento­ Received May 2, 2000; revised February 8, 2001; accepted June 8, 2001 mol. 72: 61-69.

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