AMERICAN MUSEUM NOVITATES Published by Number 1158 the AMERICAN MUSEUM of NATURAL HISTORY January 29, 1942 New York City

AMERICAN MUSEUM NOVITATES Published by Number 1158 THE AMERICAN MUSEUM OF NATURAL HISTORY January 29, 1942 New York City

REPORT ON A COLLECTION OF SPIDERS FROM MEXJCO. IV BY W. J. GERTSCH AND L. IRBY DAVIS

In the present paper, which is the fourth Cruz, June 22, 1936, two females (L. I. in a series under the above title, further Davis). records and descriptions of Mexican spiders This name is used tentatively for speci- are presented. Of rather recent date we mens from such widely separated regions as have been fortunate in securing additional Panama, Mexico and Cuba, inasmuch as important collections from various sources we are unable to distinguish differences to supplement the rich lot of material al- among the females on hand for study. The ready in our hands. It is a pleasure to Triaeris from Cuba is probably identical acknowledge the receipt of many specimens with Ischnothyreus barrowsi Chamberlin from Dr. Helmuth Wagner of Mexico, and Ivie which was described from Florida D. F., who has collected widely in southern and which apparently does not belong to Mexico. Our thanks are also due to Mr. Ischnothyreus as defined by Simon. It C. M. Bogert and Mr. H. E. Vokes of the would seem desirable to study the males American Museum who have contributed before any conclusions can be arrived at an important collection. as to the synonomy involved. The types of the species described as new are deposited in the collection of The Scaphiella iguala, new species American Museum of Natural History. Figures 1, 2 and 3 FEMALE.-Total length, 1.75 mm. Caponiidae LENGTH WIDTH Tarsonops systematicus Chamberlin Carapace 0.70 mm. 0. 53 mm. Front 0.20 0.30 Tarsonops systematicus CHAMBERLIN, 1924, Sternum 0.42 0.38 Proc. California Acad. Sci., (4) XII, p. 601, Labium 0.07 0.11 Fig. 37. Maxilla 0.15 0.12 RECORD.-NUEVO LEON: Herreras, Abdomen 1.03 0.50 November 27, 1938, one female probably Carapace bright orange-brown, thickly and this species (A. M. and L. I. Davis). finely roughened throughout with tiny rounded elevations, sparsely clothed, the principal hairs Tarsonops sectipes Chamberlin placed in three lines from the eyes to the posterior and sclerites Tarsonops sectipes CHAMBERLIN, 1924, Proc. declivity. Sternum, appendages 31- on abdomen somewhat lighter orange-brown California Acad. Sci., (4) XII, p. 599, Figs. than the carapace, smooth and shining, clothed 34. sparsely with fine black hairs. Softer mem- RECORD.-GUERRERO: Iguala, June 19, branes on abdomen white or nearly so. 1936, one female probably this species Structure typical for the genus. Carapace moderately high, convex. Clypeus sloping (A. M. and L. I. Davis). gently forward, rather high, equal in height to one and one-half times the diameter of a front Oonopidae eye. Two eyes of first row much narrower than the second (18/24), scarcely separated. Second Triaeris patellaris Bryant row moderately procurved, the median subcontiguous and also nearly touching the subequal Triaeris patellaris BRYANT, 1940, Psyche, in the ratio 4. lateral, smaller than the front eyes LXXXVI, p. 268, Fig. 8: 11. Sternum bluntly rounded behind, the RECORDS.-VERA CRUZ: Potrero, June posterior coxae separated by their length. 24, 1936, three females (L. I. Davis). Vera Legs without true spines, clothed sparsely with 2 AMERICAN MUSEUM NOVITATES [No. 1158

Fig. 1. Scaphiella iguala, new species, left male palpus, ventral view. Fig. 2. Idem, left male palpus, prolateral view. Fig. 3. Idem, epigynum of female. Fig. 4. Oonops petulans, new species, left male palpus, frontal view. Fig. 5. Idem, left male palpus, retrolateral view. Fig. 6. Idem, eyes of male. Fig. 7. Oonops puebla, new species, left male palpus, prolateral view. Fig. 8. Idem, tarsus of left palpus, ventral view. Fig. 9. Oonops cuervus, new s'pecies, eyes of female. 1942] SPIDERS FROM MEXICO. IV 3 black hairs. First leg: femur, 0.46 mm., and two young females (A. M. and L. I. patella, 0.23 mm., tibia, 0.35 mm., metatarsus, 0.32 mm., and tarsus, 0.23 mm. long. Fourth Davis). leg: femur, 0.55 mm., patella, 0.25 mm., tibia, 0.44 mm., metatarsus, 0.40 mm., and tarsus, Oonops puebla, new species 0.26 mm. long. Abdomen relatively narrow as seen from Figures 7 and 8 above, the sclerites typical, gently rounded above MALE.-Total length, 1.40 mm. the pedicle as seen from the side, not strongly angled and overlapping the posterior declivity as LENGTH WIDTH in Scaphiella hespera Chamberlin. Epigynum Carapace 0. 66 mm. 0.52 mm. as illustrated in Fig. 3, distinguished from Front 0.10 0.25 hespera by the shallow atrium which is as broad Sternum 0.43 0.40 as long and presents a round structure at the Labium 0.08 0.12 front edge and a narrow groove on each side. Maxilla 0.17 0.11 MALE.-Total length, 1.70 mm. Abdomen 0.75 0.45 LENGTH WIDTH Carapace pale yellow, sparsely clothed with Carapace 0. 67 mm. 0.52 mm. rather long suberect hairs, the eyes narrowly Front 0.20 0.30 ringed with black. Under side of the carapace Sternum 0.41 0.36 concolorous, clothed as the dorsum. Append- Labium 0.10 0.13 ages pale yellow, evenly clothed with rows of Maxilla 0.14 0.14 long hairs. Abdomen gray, clothed with long Abdomen 1.00 0.55 subprocumbent hairs. Carapace longer than broad, suboval in out- Coloration and structure in very close agree- line, narrower and subtruncate in front, the ment with the female. Eyes as in the female. sutures obsolete. Carapace convex, moder- Maxillae as broad as long. Dorsal sclerite of ately high, evenly declining forward, rapidly abdomen elongate, oval, broader behind. Legs dropping caudally from the posterior declivity. unspined. First leg: femur, 0.45 mm., patella, Clypeus very short, sloping forward, the width 0.22 mm, tibia, 0.36 mm., metatarsus, 0.31 mm., about one-third the diameter of an anterior and tarsus, 0.23 mm. long. Fourth leg: femur, lateral eye. Eyes six, all subequal and sub- 0.51 mm., patella, 0.24 mm., tibia, 0.43 mm., contiguous. Ratio of the eyes: ALE : PLE: tnetatarsus, 0.40 mm., and tarsus, 0.25 mm. long. PME = 9 : 7 : 8. First row of eyes narrower Palpus as illustrated in Figs. 1 and 2. than the second (19/24), separated by one-half TYPE LoCALITY.-Male holotype and the diameter. Second row of eyes recurved, the female allotype from Iguala, Guerrero, median contiguous, subcontiguous with the lateral. Sternum bluntly rounded behind, sepa- June 19, 1936 (A. M. and L. I. Davis). rating the posterior coxae by their width. This species is closely related to Scaphi- Front legs with weak ventral spines, the pos- ella hespera Chamberlin from which it can terior legs with better developed ventral, lateral be distinguished by the following char- and dorsal spines. First leg: femur, 0.45 mm., in sexes patella, 0.29 mm., tibia, 0.41 mm., metatarsus, acters. The abdomen both is 0.35 mm., and tarsus, 0.23 mm. long. Fourth evenly rounded as seen from the side, not leg: femur, 0.56 mm., patella, 0.29 mm., tibia, produced forward. The dorsal sclerite of 0.53 mm., metatarsus, 0.46 mm., and tar sus, the abdomen of the male is proportionately 0.26 mm. long. broader. The embolus of the male palpus Palpus as illustrated in Figs. 7 and 8. originates from a subtruncate basal process TYPE LOCAL1TY.-Male holotype from and is free on the retrolateral side of the seven miles south of Tlacotepec, Puebla, spur, not attached to apex, and the embolus June 24, 1936 (A. M. and L. I. Davis). is proportionately longer. This species is closely allied to Oonops chilapensis Chamberlin and Ivie but may Oonops secretus Gertsch be distinguished by the shape of the Oonops secretus GERTSCH, 1936, American embolus and the presence of a pale spine Mus. Novitates, No. 852, p. 8, Figs. 14, 15 and beneath it which is lacking in chilapensis. 16. RECORDS.-SAN Luis POTOSI: five Oonops furtivus Gertsch miles north of Tamazunchale, July 2, 1936, Oonops. furtivus GERTSCH, 1936, American two females probably this species (A. M. Mus. Novitates, No. 852, p. 6, Figs. 19, 20 and and L. I. Davis). TAMAULIPAS: fifteen 21. miles south of Victoria, July 2, 1936, male RECORD.-TAMAULIPAS: near State line, 4 AMERICAN MUSEUM NOVITA TES [No. 1158

west of Reynosa, November 28, 1937, one LENGTH WIDTH male (L. I. Davis and B. Brown). Carapace 0.63 mm. 0.46 mm. Front 0.10 0.23 Oonops petulans, new species Sternum 0.42 0.36 Labium 0.08 Figures 0.11 4, 5 and 6 Maxilla 0.16 0.10 MALE.-Total length, 1.55 mm. Abdomen 1.05 0.65 Carapace and appendages pale yellow. LENGTH WIDTH Abdomen gray to white. Carapace 0.70 mm. 0.54 mm. Structure nearly typical. Carapace some- Front 0.14 0.25 what more narrow in front than usual. Clypeus Sternum 0.47 0.40 sloping forward, equal in height to one-half the

Labium 0.07 0.10 diameter of a front eye. Two eyes of first row Maxilla 0.18 0.11 narrower than the second row (20/24), separated Abdomen 0.90 0.60 by eight-ninths the diameter. Second row of eyes strongly recurved, the contiguous median

slightly separated from the eyes. Carapace and appendages yellow, clothed subequal lateral Eye relations as illustrated in Fig. 9. sparsely with dark hairs. Eyes narrowly Sternum truncated behind, the posterior coxae separated ringed with black. Abdomen with a gray, by their length. set of dark Chelicerae back beneath sparse covering hairs. the overhanging elypeal margin, slender Carapace longer than broad, apically, convex, narrowed somewhat concave. in the head the width at the second region, eye Palpus relatively short, provided with hairs row, 0.30 mm., the front rounded. As gently but lacking true spines. Legs without true seen from the side carapace moderately high, spines. First leg: femur, 0.50 mm., subequal in height for most of the length, the patella, 0.24 mm., tibia, 0.43 mm., posterior declivity moderately abrupt. metatarsus, 0.37 Clypeus mm., and tarsus, 0.32 mm. long. Fourth leg: very narrow, equal in height to one-third the femur, 0.54 mm., patella, 0.25 mm., tibia, 0.45 diameter of an anterior lateral eye. Eyes all mm., metatarsus and tarsus missing. subequal and subcontiguous, occupying two- thirds of the width of the head at the second eye TYPE LoCALITY.-Female holotype from row. Ratio of the eyes: ALE : PLE : PME China, Nuevo Leon, November 28, 1937 = 10: 10 9. Two eyes of first row separated (L. I. Davis and B. Brown). by less than a diameter (8/11). Second row rather strongly recurved, the oval median sub- This small species, which may be the contiguous, slightly separated from the subequal female of stylifer Gertsch, is easily recog- lateral. Eye group as illustrated in Fig. 6. nized by reference to the chelicerae which Sternum bluntly rounded behind, separating the are more slender than usual and are set posterior coxae by their length. All legs lacking true spines. First leg: under the overhanging clypeus. The femur, 0.57 mm., patella, 0.27 mm., tibia, 0.44 palpus is of average length and lacks true mm., metatarsus, 0.41 mm., and tarsus, 0.30 spines such as are present in singulus. mm. long. Fourth leg: femur, 0.60 mm., patella, 0.27 mm., tibia, 0.51 mm., metatarsus, new 0.48 mm., and tarsus, 0.31 mm. long. Oonops tolucanus, species Palpus as illustrated in Figs. 4 and 5. Figures 11, 12 and 13 TYPE LoCALITY.-Male holotype from MALE.-Total length, 1.70 mm. San Fernando, Tamaulipas, March 28, LENGTH WIDTH 1927 (L. I. Davis). Carapace 0.65 mm. 0.50 mm. This interesting spider is most closely re- Front 0.13 0.26 lated to Oonops stylifer Gertsch which was Sternum 0.46 0.37 Labium 0.07 0.11 described from southern Texas. It may Maxilla 0.20 0.10 be distinguished by reference to the palpus, Abdomen 1.10 0.65 the embolus of which is a fine long tube and Carapace bright yellow, smooth, clothed on a stout tubercle which is originates sparsely with erect black bristles as follows: directed at nearly a right angle from the three rows of seven or eight from the eyes to the tarsus. posterior declivity; a transverse row of nine hairs on the edge of the declivity; elypeal margin new with eight principal hairs which are nearly as Oonops cuervus, species long as the length of the ocular area. Append- Figure 9 ages yellow, clothed with black hairs. Abdomen FEMALE.-Total length, 1.66 mm. nearly white, evenly covered with dark hairs. 1942] SPIDERS FROM MEXICO. IV ,5

\J 18 U/ 19 \ J 2 0 Fig. 10. Oonops singulus, new species, left palpus of female, prolateral view. Fig. 11. Oonops tolucanus, new species, left male palpus, prolateral view. Fig. 12. Idem, left male palpus, ventral view. Fig. 13. Idem, eyes of male. Fig. 14. Oonops sonora, new species, eyes of female. Fig. 15. Psilochorus conjunctus, new species, cheliceral horns of male, subdorsal view. Fig. 16. Idem, embolus of male palpus. Fig. 17. Idem, chelicera of male, lateral view. Fig. 18. Psilochorus papago, new species, cheliceral horns of male, subdorsal view. Fig. 19. Idem, embolus of male palpus. Fig. 20. Idem, chelicera of male, lateral view. 6 AMERICAN MUSEUM NOVITA TES [No. 1158

Structure typical. Clypeus very low, equal Carapace pale yellow, clothed sparsely with in height to scarcely one-fourth the diameter of long black hairs on the sides and with the usual an anterior lateral eye. Eyes six, all subequal in rows of bristles on the mid-line and back of the size. First row (anterior lateral) of eyes equal lateral eyes. Appendages concolorous, clothed in width to the posterior row, separated by eight- with black hairs, the fourth legs with a few weak elevenths their greatest diameter. Second row spines. Abdomen white, evenly covered with strongly recurved, the contiguous median long black hairs. scarcely separated from the lateral eyes. Eye Structure typical. Clypeus low, sloping for- relations as illustrated in Fig. 13. Sternum ward, equal in height to one-third the diameter of bluntly rounded behind, separating the posterior a front eye. First row of eyes narrower than the coxae by their width. Maxilla broadest at second (22/26), separated by five-elevenths of base, slender apically, curving around the the diameter. Second row moderately re- labium, armed beneath at the tip of the labium curved, the contiguous median slightly separated with a stout spur. from the equal lateral eyes. Eye relations as Legs clothed with long hairs but lacking true illustrated in Fig. 14. Chelicerae normal, spines. First leg: femur, 0.50 mm., patella, straight. Sternum bluntly pointed behind, the 0.24 mm., tibia, 0.38 mm., metatarsus, 0.30 mm., posterior coxae separated by their width. and tarsus, 0.20 mm. long. Fourth leg: femur, Legs for the most part missing. Tibia and 0.56 mm., patella, 0.25 mm., tibia, 0.44 mm., patella of the fourth leg, 0.65 mm. long. Palpus metatarsus, 0.40 mm., and tarsus, 0.20 mm. long. relatively short, the two terminal joints shorter Palpus as illustrated in Figs. 11 and 12. than the sternum, clothed with black hairs but FEMALE.-Total length, 1.87 mm. without true spines. TYPE LOCALITY.-Female holotype from LENGTH WIDTH Guaymas, Sonora, June 16, 1939 (L. I. Carapace 0.73 mm. 0.55 mm. Davis). Front 0.13 0.25 Sternum 0.45 0.40 This species may be distinguished from Labium 0.07 0.11 Oonops tolucanus, new species, by its smaller Maxilla 0.17 0.10 size and the more closely spaced front eyes. Abdomen 1.20 0.80 Oonops singulus, new species Coloration and structure closely approximat- ing the male. Maxillae normal. Palpus clothed Figure 10 with hairs, without true spines, of average FEMALE.-Total length, 1.72 mm. length. Legs without true spines. First leg: femur, 0.47 mm., patella, 0.23 mm., tibia, 0.40 LENGTH WIDTH mm., metatarsus, 0.33 mm., and tarsus, 0.20 Carapace 0.77 mm. 0.60 mm. mm. long. Fourth leg: femur, 0.55 mm., Front 0.14 0.30 patella, 0.28 mm., tibia, 0.45 mm., metatarsus, Sternum 0.46 0.46 0.43 mm., and tarsus, 0.21 mm. long. Labium 0.10 0.14 Maxilla 0.20 0.14 TYPE LoCALITY.-Male holotype, female Abdomen 1.00 0.70 allotype and paratype from Mt. Toluca, Mexico, June 28, 1936 (A. M. and L. I. Carapace and appendages concolorous, pale Davis). yellow. Abdomen gray. Superficial hairs on the specimens rubbed off. This species is readily identified by the Structure typical. Clypeus equal in height large blade-like processes on the male pal- to one-third the diameter of an anterior eye. pus, the embolus and the conductor, which Eyes relatively large, all subequal in size. First are of set at a right row of eyes narrower than the second (27/34), nearly equal length and separated by four-sevenths the diameter. Sec- angle to the tarsus. ond row moderately recurved, the median contiguous, slightly separated from the posterior Oonops sonora, new species lateral and anterior lateral eyes. Sternum bluntly rounded behind, the posterior coxae Figure 14 separated by their width. FEMALE.-Total length, 1.30 mm. Front legs apparently not provided with true spines. First leg: femur, 0.55 -mm., patella, LENGTH WIDTH 0.28 mm., tibia, 0.47 mm., metatarsus, 0.45 mm., Carapace 0.56 mm. 0.44 mm. and tarsus, 0.25 mm. long. Fourth leg: femur, Front 0.10 0.19 0.73 mm., patella, 0.30 mm., tibia, 0.60 mm., Sternum 0.35 0.31 metatarsus, 0.62 mm., and tarsus, 0.27 mm. long. Labium 0.07 0.10 Palpus elongate, provided with stout spines as Maxilla 0.16 0.10 shown in Fig. 10. Measurements of palpus: Abdomen 0.80 0.46 femur, 0.30 mm., patella, 0.20 mm., tibia, 0.24 1942] SPIDERS FROM MEXICO. IV 7

mm., and tarsus, 0.36 mm. long. Tibia and tar- RECORD.-CHIHUAHUA: Ahumada, June sus of palpus exceed the sternum in length. 10, 1939, three males and one female (A. TYPE LoCALITY.-Female holotype from M. and L. I. Davis). Potrero, Vera Cruz, June 24, 1936 (L. I. Davis). Physocyclus hoogstraali, new species This interesting species is distinguished Figure 45 from others known from Mexico by the FEMALE.-Total length, 5.20 mm. Carapace, very long, strongly spined palpus. It be- 2.35 mm. long, 2.65 mm. wide. Abdomen, 3.00 longs in the group for which the generic mm. long, 2.50 mm. wide. Carapace pale yellowish brown, sparsely name Oonopoides was proposed, with clothed with erect setae, the median and cephalic Oonops spinimanus Simon as genotype. grooves dusky brown, the clypeus with a narrow Oonops singulus, new species, differs from longitudinal brown stripe. Sternum pale yel- spinimanus in having the eyes less widely lowish, with a median dusky figure enclosing a pale spot. Legs pale yellowish brown, the tibiae separated. faintly annulate in black at base and apex. Abdomen dull gray to white, with a dusky basal Pholcidae hastate marking and several transverse black figures. Pholcus unicolor Petrunkevitch Structure typical. Clypeus inclined forward, equal in height to twice the length of the ocular Pholcus unicolor PETRUNKEVITCH, 1929, Trans. group. First eye row gently procurved, the Connecticut Acad. Arts and Sci., XXX, pp. 147- upper edges forming a straight line, the median 150, Figs. 139-143. eyes slightly separated, as far from the lateral RECORD.-SINALOA: Hotel Sinaloa, Culi- which are larger in the ratio 20: 13. Second acan, November 25, 1939, two males (C. row of eyes moderately recurved, the median separated by slightly more than the diameter, M. Bogert and H. E. Vokes). contiguous with the subequal lateral eyes. Median ocular quadrangle broader than long Physocyclus dugesi Simon (50/38), narrowed in front, the anterior eyes much smaller. Sternum broadly truncated be- Physocyclus dugesi SIMoN, 1893, Ann. Soc. tween the posterior coxae, separating them by Ent. France, LXII, p. 320. their width. RECORD.-DISTRITo FEDERAL: Mixe- Legs covered with rows of fine hairs, without mac, October 10, 1940, one male (Dr. H. true spines. First leg: femur, 10.50 mm., patella, 1.10 mm., tibia, 11.40 mm., metatarsus, Wagner). 15.50 mm., and tarsus, 2.30 mm. long. Epigynum as illustrated in Fig. 45. Physocyclus globosus Taczanowski TYPE LoCALITY.-Female holotype and Pholcus globosus TACZANOWSKI, 1873, Horae two paratypes from Bat Cave, Sabinas Soc. Ent. Ross., X, p. 105. Hidalgo, Nuevo Leon, 1300 feet, June 14, RECORDS.-CHIAPAS: Tonala, August, 1940 (H. Hoogstraal). 1909, males and females (Dr. A. Petrunke- This species is most closely related to P. vitch). OAXACA: San Geronimo, July, californicus Chamberlin and Gertsch. The 1909, male and females (Dr. A. Petrunke- epigynum is proportionately longer, nar- vitch). VERA CRUZ: La Buena Ventura, rowed apically, and has two contiguous July, 1909, one male (Dr. A. Petrunke- rounded tubercles at the apex. vitch). Hacienda la Oaxaquefia, thirty kilometers south of Jesus Carranza, Octo- Artema atlanta Walckenaer ber 15, 1939, one female (C. M. Bogert and Artema atlanta WALCKENAER, 1837, Ins. Apt., H. E. Vokes). Vera Cruz, one female (Dr. I, p. 656. A. Petrunkevitch). NUEVo LEON: Tama- RECORDS.-NAYARIT: Acaponeta, No- zunchale, September 27, 1939, one female vember 20, 1939, male and immature speci- and immature specimens (C. M. Bogert and mens (C. M. Bogert and H. E. Vokes). H. E, Vokes). SINALOA: Hotel Sinaloa, Culiacan, No- vember 25, 1939, male and female (C. M. Physocyclus enaulus Crosby Bogert and H. E. Vokes). Culiacan, Physocyclus enaulus CROSBY, 1926, Proc. Ent. June 19, 1939, immature male (A. M. and Soc. Washington, XXVIII, p. 1, P1. i, fig. 1. L. I. Davis). 8 AMERICAN MUS.'E'UM NOVITATES [No. 1158

Pholcophora texana Gertsch with a stout curved process originating near the base on the frontal aspect as illustrated in Figs. Pholcophora texana GERTSCH, 1935, American 18 and 20. Mus. Novitates, No. 792, p. 11, Figs. 22, 23 and Embolus of palpus as illustrated in Fig. 19. 24. Legs pale yellow, unmarked. First leg: RECORD.-TAMAULIPAS: Rio Guayalejo, femur, 5.75 mm., patella, 0.50 mm., tibia, 5.75 near Forlon, April 16, 1938, one female (L. mm., metatarsus, 7.25 mm., and tarsus, 1.30 mm. long. Femur five times as long as carapace. I. Davis and B. Brown). Abdomen globose, somewhat higher than long, green with white flecks. Psilochorus pallidulus Gertsch FEMALE.-Total length, 2.70 mm. Carapace, Psilochorus pallidulus GERTSCH, 1935, Ameri- 1.05 mm. long, 1.05 mm. wide. Abdomen, 1.70 can Mus. Novitates, No. 792, p. 13, Figs. 28, 29 mm. long, 1.20 mm. wide. and 30. Coloration essentially as in the male. Cara- pace and eye relations as in the male. Legs pro- RECORD.-TAMAULIPAS: Mier, October portionately shorter, the first femur being four 24, 1937, one female (L. I. Davis). times as long as the carapace. First leg: femur, 4.50 mm., patella, 0.50 mm., tibia, 4.70 mm., Psilochorus coahuilanus Gertsch and metatarsus, 5.60 mm., and tarsus, 1.25 mm. long. Femora with a faint dark annulus at distal end. Davis Epigynum as illustrated in Figs. 21, 22, and 23. Psilochorus coahuilanus GERTSCH AND DAVIS, 1937, American Mus. Novitates, No. 961, p. 10, TYPE LoCALITY.-Female holotype and Fig. 16. two paratypes from twenty-seven miles RECORD.-COAHUILA: twenty miles east south of Nogales, Arizona, in Sonora, of San Pedro, July 5, 1936, one female Mexico, June 15, 1939 (A. M. and L. I. (A. M. and L. I. Davis). Davis). Male allotype and male and female paratypes from Tucson, Arizona, July, Psilochorus redemptus Gertsch and 1935 (P. Steckler). Male and female Mulaik paratypes from Canada del Oro, Santa Psilochorus redemptus GERTSCH AND MULAIK, Catalina Mountains, near Tucson, Ari- 1940, Bull. American Mus. Nat. Hist., LXXVII, zona, August, 1937 (P. Steckler). Male p. 322. paratype from Oro Blanco Mountains, near RECORDS.-TAMAULIPAS: Mier, October Nogales, Arizona, July, 1937 (P. Steckler). 24, 1937, one female (L. I. Davis). NuEvo This species is most closely related to LEON: Monterrey, November 27, 1937, Psilochorus rockefelleri Gertsch of Arizona. male and female (A. M. and L. I. Davis and The epigynum of the female has the distal B. Brown). end of the principal ventral plate weakly emarginated at the tip whereas inr rockefel- Psilochorus papago, new species leri the tip is expanded into distinct proc- Figures 18 to 23 esses. The cheliceral spur of the male of MALE.-Total length, 2.50 mm. Carapace, papago is proportionately broader. 1.10 mm. long, 1.06 mm. wide. Abdomen, 1.70 mm. long, 1.35 mm. wide. Coloration and structure typical for the genus. Psilochorus sinaloa, new species Carapace pale yellow, the clypeus and head dusky, the median groove and cephalic sutures Figures 27 and 28 dark, forming the usual Y-shaped figure. Cara- FEMALE.-Total length, 2.25 mm. Carapace,f pace about as broad as long, the convex pars 0.90 mm. long, 0.88 mm. wide. Abdomen, 1.33 thoracica lower as usual than the moderately mm. long, 1.20 mm. wide. elevated pars cephalica. Clypeus broad, sloping Coloration essentially as in papago but t.he downward. Eyes of first row in a procurved legs are light brown and the dark annulae at dis- line, contiguous, the median smaller in the ratio tal end of femora and tibiae are more strongly 5 : 8. Second row essentially straight, the marked. Sternum dusky yellow; coxae brown. median separated by about their diameter, con- Structure in close agreement with papago. tiguous with the subequal lateral eyes. Median First femur scarcely four times as long as the ocular quadrangle broader than long (40/27), carapace. First leg: femur, 3.20 mm., patella, greatly narrowed in front, the anterior eyes 0.80 mm., tibia, 3.30 mm., metatarsus, 3.70 mm., smaller. Lateral eyes of each side contiguous. and tarsus, 0.75 mm. long. Abdomen palel Sternum and coxae pale yellow, unmarked, blue, the sides with dark blue spots, the dorsum broadly truncated behind where the posterior with a paler longitudinal stripe. coxae are separated by their width. Chelicera Epigynum as illustrated in Figs. 27 and 28. 1942] SPIDERS FROM MEXICO. IV 9

24 21

I/' E 25 22

t 2~~~~~~2

Fig. 21. Psilochorus papago, new species, epigynal plate of female, frontal view. Fig. 22. Idem, epigynum, ventral view. Fig. 23. Idem, epigynum, lateral view. Fig. 24. Psilochorus conjunctus, new species, epigynal plate of female, frontal view Fig. 25. Idem, epigynum, ventral view. Fig. 26. Idem, epigynum, lateral view. Fig. 27. Psilochorus sinaloa, new species, epigynum of female, lateral view. Fig. 28. Idem, epigynal plate of female, frontal view. 101AMERICAN MUSEUM NOVI TA TES [NO. 1158

TYPE LoCALITY.-Female holotype from Modisimus inornatus Cambridge Culiacan, Sinaloa, June 19, 1939 (A. M. Modisimus inornatus 0. CAMBRIDGE, 1895, and L. I. Davis). Biol. Centr. Amer., Arach., I, p. 149, P1. xx, This species may be distinguished from fig. 7, P1. xxxii, fig. 4. papago by its shorter legs, darker colora- RECORD.-CHIAPAS: La Zacualpa, Au- tion, and by the presence of a pair of short gust, 1909, one male (Dr. A. Petrunkevitch). spurs on the frontal surface of the principal ventral plate of the epigynum. Modisimus texanus Banks Modisimus texanus BANKS, 1905, Proc. Ent. Psilochorus conjiunctus, new species Soc. Washington, VII, p. 94. RECORDS.-TAMAULIPAS: two miles east Figures 15 to 17 and 24 to 26 FEMALE.-Total length, 2.80 mm. Carapace, of Nuevo Morelos, December, 1939, male, 1.30 mm. long, 1.30 mm. wide. Abdomen, 1.75 two females (A. M. Davis). SAN Luis mm. long, 1.50 mm. wide. POTOSI: a palm jungle twenty miles north Coloration as in papago and other species of of Valles, November 26, 1938, male and the genus. Legs faintly annulate in black. Y-shaped black maculation on the carapace female (A. M. and L. I. Davis). strongly marked. Sternum pale, unmarked. Abdomen gray, with blue spots. Structure Dictynidae typical. Clypeus sloping forward, concave, equal in height to about twice the length of the Lathys coralynae, new species eye group. First row of eyes moderately pro- Figure 44 curved, contiguous or nearly so, the median length, 2.00 mm. much smaller in the ratio 10 :15. Second row MALE.-Total essentially straight, the median separated by LENGTH WIDTH slightly more than the diameter, contiguous Carapace 0.85 mm. 0.70 mm. with the subequal lateral eyes. Median ocular Front 0.17 0.42 quadrangle broader than long (40/26), narrowed Sternum 0.54 0.47 in front (40/20), the anterior eyes much smaller. Labium 0.16 0.20 First leg: femur, 3.80 mm., patella, 0.90 Maxilla 0.30 0.16 mm., tibia, 4.15 mm., metatarsus, 4.45 mm., and Abdomen 1.20 0.85 tarsus, 1.15 mm. long. MAyLE.Ulil.;rarr8al-V:-ILULUUolr+.ataength 2.55in--111 mm.c)AS90ACar one Carapace almost uniform dusky brown, the MALE.-Total length, 2.55 mm. Carapace, margins with a narrow darker seam. Sternum 1.15 mm. long, 1.10 mm. wide. Abdomen, 1.50 dusky on the margins, paler in the middle. mm. long, 1.30 mm. wide. Legs pale yellowish gray, marked with dusky Coloration and structure typical. Legs very black annulae. Clothing on carapace normal, faintly annulate in black. Sternum pale. Eyes the pars cephalica with the usual long bristles. as in the female. Chelicera with a stout, api- Appendages rather sparsely clothed with black cally truncate spur which originates near the bristles. Abdomen uniformly black above but base, the details as shown in Figs. 15 and 17. showing a greenish iridescence in certain lights. First leg: femur, 4.10 mm., patella, 0.40 mm., V ofabdomen nrly ck. tibia,tiba,4.25-25mm.mm., meatasusmetatarsus, 4.04.80 m.,mm., andnd tar-ar- VenterStructureof abdomentypical.nearlyParsblack.cephalica broad, Palpus essentially as in Psilochorus imitatus moderately elevated, convex, highest at a point a GertsheGertsch andand MuluaiktdiffedingMulaik, differingFig.in the detailsofdetails of rowlittleofineyesfrontstraight,of the posteriorthe mediandeclivity.separatedFirstby the embolus as illustrated ini Fig. 16. scarcely their diameter, as far from the lateral TYPE LoCALITY.-Female holotype and eyes which are larger in the ratio 12 5. Second male allotype from Diamante Drive, five row procurved, the median separated by four- the subequal miles southeast of Saltillo, Coahuila, No- fifthslateral.theirMediandiameter,ocularas farquadranglefrom broader vember 26, 1937 (A. M. and L. I. Davis). than long (26/23), narrowed in front (26/14), the anterior median eyes smaller in the ratio 5 . 10. Clypeus equal in height to the diameter of Modisimus maculatipes Cambridge an anterior median eye. Chelicerae normal, Modisimus maculatipes 0. CAMBRIDGE, 1895, the lower margin with three subequal teeth, the Biol. Centr. Amer., Arach., I, p. 148, P1. xx, upper with three of which the distal one is larger. fig. 5. Sternum truncated in front, produced between RECORD.-VERA CRUZ: La Buena Ven- the posterior coxae as a rounded lobe and sepa- tura,tr,July,JulyX 1909, one female (Dr. A. Pe- roundedrating themat thebydistaltheirend,width.five-eighthsLabiumasbroadlylong as trunkevitch). the parallel, subquadrangular maxillae. 19421 SPIDERS FROM MEXICO. IV 11

3!4 33 2i.3.Dcyacilp,nwseis29 eigynum 32fmae312

Fig. 29. Dictyna altamira, new species, epigynum of female. Fig. 30. Dictyna chilapa, new species, epigynum of female. Fig. 31. Dictyna cholla, new species, abdomen of female, dorsal view. Fig. 32. Dictyna moctezuma, new species, epigynum of female. Fig. 33. Dictyna sonora, new species, epigynum of female. Fig. 34. Idem, abdomen of female, dorsal view. Fig. 35. Idem, left male palpus, retrolateral view. Fig. 36. Idem, left male palpus, dorsal view. Fig. 37. Dictyna secuta Chamberlin, epigynum of female. Fig. 38. Dictyna navajoa, new species, epigynum of female. 12 AMERICAN MUSEUM NOVITA TES [.No. 1158

All femora with weak median spine above. LENGTH WIDTH First metatarsus with two weak spines near the Carapace 0.80 mm. 0.61 mm. distal end. First leg: femur, 0.72 mm., pa- Front 0.20 0.35 tella, 0.30 mm., tibia, 0.65 mm., metatarsus, 0.53 Sternumn 0.48 0.40 mm., and tarsus, 0.35 mm. long. Labium 0.19 0.17 Male palpus as illustrated in Fig. 44. Maxilla 0.30 0.13 TYPE LOCALITY.-Male holotype from Abdomen 1.00 0.67 twenty miles east of Ciudad del Maiz, San Coloration and geineral structure esseintially as Luis Potosi, March 23, 1940 (A. M. Davis). in the female. Pars cephalica more stirongly This species may be distinguished from elevated. Cheliceirae curved, excavated oin inner Lathysfoxi Marx by the much darker color- side, the lower margin with two tiny teeth, the upper with three larger teeth. Legs propoirtion- ation. The twisted conductor of the em- ately longer. First leg: femur, 0.73 inm., bolus is proportionately longer than in the patella, 0.25 mm., tibia, 0.63 mm., mietatarsus, other known species. 0.54 inm., and tarsus, 0.36 mm. lonig. Palpus as illustrated in Figs. 35 and 36. TYPE LOCALITY.-Male holotype and Dictyna sonora, new sr?ecies female allotype from Guaymas, Sonora, Figures 33 to 36 June 16, 1939 (L. I. Davis). FEM.LE.-Total length, 1.90 mimn. This species is characterized by the en- larged, globose patella of the male palpus. LENGTH WIDTH It is distinct from Dictyna floridana Banks and D. cubana Bryant by the details of the Carapace 0. 85 mm. Front 0.35 0. 19 tibia, patella and tarsus of the palpus. In Sternum 0.56 0.43 sonora the conductor of the embolus forms Labium 0.19 0.19 a long loop which is strongly curve(d ven- Maxilla 0.27 0.13 trad whereas in the other species the con- Abdomen 1.15 0.85 ductor is essentially normal.

Carapace orange-brown, the pars thoracica Dictyna cholla, new species dusky brown and with a narrow darker marginal seam. Sternum light yellowish brown, dusky on Figures 31 and 39 the margins. Legs pale yellowish brown, with FEMALE.-Total length, 1.50 mm. very faint traces of dusky annulae. Abdomen nearly white above, with a distinct pattern of LENGTH WIDTH black spots as shown in Fig. 34. Venter white. Carapace 0.60 mm. 0.44 mmn. Structure essentially typical. Carapace mod- Front 0.13 0.25 erately elevated, the pars cephalica relatively Sternum 0.36 0.33 broad and low, the median groove obsolete. Labium 0.10 0.12 Clypeus sloping forward, equal in height to Maxilla 0.16 0.08 about twice the diameter of an anterior median Abdomen 0.90 0.60 eye. First row of eyes gently procurved as seen from in front, the median separated by two- Carapace pale yellowish brown, clothed thirds the diameter, half as far from the lateral sparsely with erect black hairs, the eyes narrowly which are larger in the ratio 9 : 7. Second row ringed with black. Sternum and legs nearly gently recurved, the median separated by seven- concolorous, duller, without darker markings. ninths their diameter, scarcely as far from the Abdomen pale yellow, almost white, with a pat- subequal lateral eyes. Median ocular quad- tern of distinct black spots on the dorsum as rangle broader than long (22/20), narrowed in shown in Fig. 31. Venter unmarked except for a front (22/18), the anterior median eyes smaller small black spot on each side near the cribellum. in the ratio 9 7. Chelicerae finely roughened Structure in close agreement with sonora. in front, with a weak tooth at the base on the Clypeus equal in height to the diameter of an outer side. Lower margin of the furrow of the anterior median eye. First row of eyes straight, chelicera with a tiny tooth on the lower margin the median separated by three-fifths the diame- near the base of the claw and three subequal ter, subcontiguous with the lateral eyes which teeth on the upper margin. are larger in about the ratio 4 : 6. Second row Legs without true spines. First leg: femur, recurved, the median separated by their diame- 0.70 mm., patella, 0.26 mm., tibia, 0.55 mm., ter, about as far from the subequal lateral metatarsus, 0.50 mm., and tarsus, 0.32 mm. long. eyes. Median ocular quadrangle broader than Epigynum as illustrated in Fig. 33. long (14/12), narrowed in front in the same MALE -Total length, 1.77 mm. ratio, the anterior median eyes smaller in about 1942] SPIDERS FROM MEXICO. IV 13

3,9 41

A41

,42

46 Fig. 39. Dictyna cholla, new species, epigynum of female. Fig. 40. Oecobius vokesi, new species, epigynum of female. Fig. 41. Uloborus abstrusus, new species, epigynum of female. Fig. 42. Idem, left male palpus, lateral view. Fig. 43. Ariston reticens, new species, left male palpus, lateral view. Fig. 44. Lathys coralynae, new species, left male palpus, lateral view. Fig. 45. Physocyclus hoogstraali, new species, epigynum of female, ventral view. Fig. 46. Dictyna sinaloa, new species, epigynum of female. 14 AMERICAN MUSEUM NOVITA TES [No. 1158 the ratio 4: 6. Chelicerae normal, with a weak 0.75 mm., patella, 0.25 mm., tibia, 0.58 mm., tooth at base on frontal aspect. metatarsus, 0.52 mm., and tarsus, 0.34 mm. long. Legs without true spines. First leg: femur, Epigynum as illustrated in Fig. 32. 0.50 mm., patella, 0.18 mm., tibia, 0.37 mm.. metatarsus, 0.30 mm., and tarsus, 0.20 mm, TYPE LOCALITY.-Female holotype and long. paratype from Guaymas, Sonora, June 16, Epigynum as illustrated in Fig. 39. 1939 (L. I. Davis). TYPE LOCALITY.-Female holotype from This species differs from sonora in having twenty-seven miles south of Nogales, in the median quadrangle as broad as long and Sonora, Mexico, June 15,1939 (L. I. Davis). not narrowed in front and in having these Two female paratypes from fifteen miles eyes subequal in size. east of Nogales, Arizona, June 23, 1939 (L. I. Davis). Dictyna volucripes Keyserling Dictyna volucripes KEYSERLING, 1881, Verh. This small species may be distinguished Zool.-Bot. Gesell. Wien, XXXI, p. 286, P1. xi, from Dictyna sonora by the smaller size, fig. 11. the unmarked carapace and the different RECORD.-CHIHUAHUA: forty-four miles pattern on the abdomen. The epigynum north of Chihuahua, June 13, 1939, one of sonora presents an appendage which male (A. M. and L. I. Davis). points caudad as a distinct finger whereas in cholla the openings are situated on an ele- Dictyna annexa Gertsch and Mulaik vation that is directed forward. Dictyna annexa GERTSCH, 1936, American Mus. Novitates, No. 851, p. 6, fig. 8. Dictyna moctezuma, new species RECORD.-NUEvO LEON: Monterrey, Figure 32 November 27, 1937, one female (A. M. FEMALE.-Total length, 2.15 mm. and L. I. Davis). LENGTH WIDTH Carapace 0.80 mm. 0.67 mm. Dictyna sinaloa, new species Front 0.17 0.38 Figure 46 Sternum 0.55 0.45 FEMALE.-Total length, 1.70 mm. Labium 0.17 0.20 Maxilla 0.26 0.14 LENGTH WIDTH Abdomen 1.45 0.95 Carapaoe 0.70 mm. 0.57 mm. Front 0.15 0.33 Carapace light yellowish brown, dusky on the Sternum 0.46 0.42 thoracic portion, clothed sparsely with white Labium 0.14 0.17 scaly hairs and set with a few black setae, most Maxilla 0.20 0.14 of them on the pars cephalica. Sternum and Abdomen 1.10 0.78 legs a paler yellowish brown, unmarked, clothed with rows of pale hairs. Abdomen in holotype Carapace dull reddish brown, the head darker almost all white above, coarsely reticulate in on the sides, the eyes ringed with black, the cloth- gray, the venter pale. Abdomen in paratype ing sparse except on the pars cephalica where white with a dorsal pattern of brown spots there are rows of long white hairs. Sternum essentially as in sonora (Fig. 34) but the caudal yellowish brown. Legs lighter yellowish brown, marks are less sharply indicated and are more the femora dusky in distal half, the tibiae annu- closely grouped together. late at base and distal end, the metatarsi indis- Structure essentially as in sonora. Clypeus tinctly annulate. Abdomen reddish brown, slightly higher than the diameter of an anterior with an indistinct median longitudinal pale median eye. First row of eyes straight, the stripe the whole length which encloses a median median separated by scarcely their full diaine- darker stripe. Venter of abdomen pale yellow- ter, nearly half as far from the subequal lateral ish brown. eyes which are only slightly larger in the ratio Structure typical, in close agreement with 9 : 8. Second row moderately recurved, the Dictyna annexa Gertsch and Mulaik. Clypeus median separated by their diameter, as far from equal in height to the diameter of an anterior the subequal lateral eyes. Median ocular quad- median eye. First eye row straight, the median rangle as broad as long and as wide in front as separated by their radius, subcontiguous with behind, the eyes subequal. Chelicerae normal, the slightly larger lateral eyes. Second row lightly roughened on front and with a weakly de- gently recurved, the medians separated by two- veloped lateral spur at base. thirds their diameter, as far from the subequal Legs without true spines. First leg: femur, lateral eyes. Median ocular quadrangle as broad 11942] SPIDERS FROJM MEXICO. IV 15

as long, slightly narrowed in front (18/20); the triangular piece separating the openings. of anterior eyes somewhat smaller. Chelicerae normal. the epigynum. Legs without true spines. First leg: femur, 0.65 mm., patella, 0.21 mm., tibia, 0.47 mm., Dictyna segregata Gertsch and Mulaik iimetatarsus, 0.46 mm., and tarsus, 0.28 mm. long. Dictyna segregata GERTSCH AND MULAIK, 1936, Epigynum as illustrated in Fig. 46. American Mus. Novitates, No. 851, p. 4, Figs TYPE LOCALITY.-Female holotype and 13 and 14. two paratypes from Culiacan, Sinaloa, RECORD.-SINALOA: Culiacan, June 19, June 19, 1939 (A. M. and L. I. Davis). A 1939, one female (A. M. and L. I. Davis). female from Horsetail Falls, Nuevo Leon, November 27, 1937 (L. I. Davis and B. Dictyna mulegensis Chamberlin Brown) is referred to this species with Dictyna mulegensis CHAMBERLIN, 1924, Proc. some doubt. California Acad. Sci., (4) XII, p. 582, Figs. 7, 8 and 9. Dictyna altamira, new species RECORDS.-SINALOA: Culiacan, June 19, Figure 29 1939, one male and four females (A. M. FEMALE.-Total length, 1.95 mm. and L. I. Davis). TAMAULIPAS: Rio Frio, at Limon, April 18, 1938, males and fe- LENGTH WIDTH males (A. M. and L. I. Davis). Rio Guaya- Carapace 0.90 mm. 0. 70 mm. lejo, near Forlon, April 16, 1938, four fe- Front 0.21 0.40 Sternum 0.53 0.46 males (L. I. Davis and B. Brown). One Labium 0.17 0.20 mile southeast of Villa Juarez, April 17, Maxilla 0.26 0.14 1938, three males and two females (L. I. Abdomen 1.20 0.80 Davis). River twenty miles east of Villa Carapace dull brown, darker on the sides of Juarez, April 8, 1939, two males and fe- ithe head and with dark radiating lines on the pars males (A. M. Davis). thoracica. Sternum dusky brown. Legs pale yellow, unmarked. Dorsum of abdomen bright Dictyna calcarata Banks yellow, only faint traces of the normal basal maculation and caudal bars being evident, Dictyna calcarata BANKS, 1904, Proc. Cali- clothed thickly with white hairs. Venter of fornia Acad. Sci., (3) III, p. 342, P1. XL, fig. 42. abdomen yellow. RECORDS.-CHIHUAHUA: Chihuahua, Structure in close agreement with Dictyna May 12, -1939, two males, two females annexa Gertsch and Mulaik. Carapace rather broad in front, the pars cephalica strongly ele- (L. I. Davis). Ahumada, June 10, 1939, |vated. Clypeus equal in height to more than one male and female (A. M. and L. I. Ithe diameter of an anterior median eye (11/7). Davis). SINALOA: Culiacan, June 19, First row of eyes straight, the median separated 1939, males and females (A. M. and L. I. by their diameter, two-thirds as far from the subequal lateral eyes. Second row moderately re- Davis). curved, the median separated by their full diameter, as far from the subequal lateral eyes. Dictyna chilapa, new species Median ocular quadrangle broader than long Figure 30 (24/22), narrowed in front in the same ratio, the eyes subequal. Chelicerae normal. FEMALE.-Total length, 2.15 mm. Legs without true spines. First leg: femur, LENGTH WIDTH 0.80 mm., patella, 0.26 mm., tibia, 0.60 mm., Carapace 0.90 mm. 0.66 mm. metatarsus, 0.56 mm., and tarsus, 0.33 mm. long. Front 0.17 0.32 Epigynum as illustrated in Fig. 29. Sternum 0.54 0.46 TYPE LOCALITY.-Female holotype from Labium 0.19 0.20 Altamira, Tamaulipas, April 8, 1939 Maxilla 0.25 0.13 (A. M. and L. I. Davis). Abdomen 1.30 0.75 This species is similar in structure to Carapace light brown, darker on the sides of Dictyna annexa Gertsch and Mulaik. It the head and the pars thoracica, the latter with darker radiating lines. Sternum light brown. differs in lacking a median dark band on Legs pale yellowish brown, without signs of the venter of the abdomen which is all darker markings. Abdomen gray with a reddish yellow and by the greater width of the cast, marked above by a longitudinal dark 16 AMERICAN MUSEUM NOVITATES [No. 1158 maculation from base to the middle and two eyes. Median ocular quadrangle as broad as pairs of dark spots in the caudal portion. Mid- long, narrowed in front (24/20), the anterior dle of the dorsum with white spots. Venter eyes slightly smaller. Chelicerae normal, rough- gray. ened in front, with a weakly developed tooth Structure in close agreement with Dictyna near the base. jacalana Gertsch and Davis. Clypeus scarcely Legs without true spines. First leg: femur, as high as the diameter of an anterior median 0.80 mm., patella, 0.27 mm., tibia, 0.71 mm., eye. First row of eyes straight, the median metatarsus, 0.57 mm., and tarsus, 0.36 mm. long. separated by the radius, half as far from the Epigynum as illustrated in Fig. 38. slightly larger lateral eyes. Second row moder- from ately recurved, the median separated by two- TYPE LoCALITY.-Female holotype thirds the diameter, as far from the subequal Guaymas, Sonora, June 16, 1939 (L. I. lateral eyes. Median ocular quadrangle broader Davis). than long (23/22), narrowed in front (23/21), This species resembles Dictyna calcarata the anterior eyes slightly smaller. Chelicera Banks in color and general structure and somewhat curved, lightly excavated on the inner side, with a weak tooth at base on outer side. may represent only an extreme variant. Legs without true spines. First leg: femur, It is distinct in its smaller size and in the 0.93 mm., patella, 0.26 mm., tibia, 0.82 mm., details of the epigynum as illustrated. metatarsus, 0.67 mm., and tarsus, 0.40 mm. long. Epigynum as illustrated in Fig. 30. Dictyna secuta Chamberlin TYPE LoCALITY.-Female holotype from Figure 37 Acapulco, Guerrero, June 17, 1936 (L. I. Dictyna secuta CHAMBERLIN, 1924, Proc. Cali- Davis). fornia Acad. Sci., (4) XJI, p. 583, Fig. 10. This species closely resembles jacalana RECORD.-SONORA: Guaymas, June 16, but may be distinguished by lacking dark 1939, one female (L. I. Davis). annulae on the legs. Dictyna longispina Emerton Dictyna navajoa, new species Dictyna longispina EMERTON, 1888, Trans. Figure 38 Connecticut Acad. Arts and Sci., VII, p. 446, FEMALE.-Total length, 2.60 mm. PI. ix, fig. 4. RECORD.-TAMAULIPAS: Rio Guayalejo, LENGTH WIDTH near Forlon, April 16, 1938, one male (L. I. Carapace 0.86 mm. 0.69 mm. Front 0.20 0.34 Davis and B. Brown). Sternum 0.55 0.48 Labium 0.16 0.20 Dictyna cambridgei Gertsch and Ivie Maxilla 0.24 0.13 Dictyna cambridgei GERTSCH AND IVIE, 1936, Abdomen 1.80 1.40 American Mus. Novitates, No. 858, p. 10, Figs. 9, 22-24. Carapace almost uniform dark brown, the pars thoracica with darker radiating lines. Sternum RECORD.-SAN Luis POTOSI: two miles light brown. Legs pale yellowish brown, marked north of Tamazunchale, November 25, with narrow brown annulae most of which are 1938, one male (A. M. Davis). incomplete above. Abdomen gray, with a con- spicuous median longitudinal, irregular, quad- rangular maculation from base to middle of dor- Dictyna reticulata Gertsch and Ivie sum, with a series of spots on each side in the Dictyna reticulata GERTSCH AND IVIE, 1936, caudal portion, and several small spots along American Mus. Novitates, No. 858, p. 7, Fig. 27. each side. Venter pale, with a median dusky stripe made up of spots and a series of spots on RECORD.-CHIHUAHUA: Ahumada, June each side continuous with the sides of the 10, 1939, males and females (A. M. and L. abdomen. I. Davis). Structure in very close agreement with Dictyna calcarata Banks. Head considerably narrowed in front, the pars cephalica high and convex. Dictyna consulta Gertsch and Ivie Clypeus slightly wider than the diameter of an Dictyna consulta GERTSCH AND IVIE, 1936, anterior median eye (10/8). First row of eyes American Mus. Novitates, No. 858, p. 6, Figs. 12 straight, the median separated by scarcely their and 13. diameter (8/7), nearer. the lateral (8/5), and RECORD.-CHIIHUAHUA: forty-four miles smaller in the ratio 8 : 10. Second row of eyes moderately recurved, the median separated by north of Chihuahua, June 13, 1939, one their diameter, as far from the subequal lateral male (A. M. and L. I. Davis). 19421 SPIDERS FROM MEXICO. IV 17

Mallos niveus Cambridge in height to the diameter of an anteiior median eye. First row of eyes procurved as seen from Mallos niveus 0. CAMBRIDGE, 1902, Biol. in front, the median separated by three-fourths Centr. Amer., Arach., I, p. 308, PI. xxxv, fig. 1. their diameter, about twice as far from the RECORDS.-TAMAULIPAS: Rio Frio, near smaller lateral eyes (12/17). Second row Ciudad Mante, December 25, 1939, one shorter than the first (65/60), recurved, a line along the front edges of the posterior lateral female (F. Norman). SAN Luis POTOSI: touching the caudal edges of the median eyes. Rio Frio, November 28, 1940, males and Posterior median eyes separated by two diame- females (A. M. Davis). NUEvo LEON: ters, one diameter from the posterior lateral Horsetail Falls, November 27, 1937, one eyes. Median ocular quadrangle about as broad as long, narrowed in front (35/30), the male (L. I. Davis and B. Brown). front eyes slightly larger. Lateral eyes of each QUERETARO: San Juan del Rio, October 2, side separated by about two diameters of the 1940, one female (Dr. H. Wagner). posterior lateral eye. Legs armed with black spines. First leg: Mallos arizonensis Chamberlin femur, dorsal, 1 median, prolateral, a series of five in distal half of segment, retrolateral, a Dictynoides arizonensis CHAMBERLIN, 1919, series of four; patella, dorsal, 1 apical; tibia, Ann. Ent. Soc. America, XII, p. 244, P1. XVI, dorsal, 1 basal and 1 pair in distal half, pro- fig. 1. lateral, a row of three, retrolateral, two, ventral, RECORD.-QUERETARO: San Juan del a row of four weak spines; metatarsus, retro- Rio, October female lateral, two weak spines, and ventral, four weak 2, 1940, one (Dr. H. spines. First leg: femur, 1.50 mm., patella, Wagner). 0.40 mm., tibia, 1.42 mm., metatarsus, 1.44 mm., and tarsus, 0.52 mm. long. Uloboridae Palpus as illustrated in Fig. 43. TYPE LOCALITY.-Male holotype and Miagrammopes mexicanus 0. P. two immature paratypes from twenty- Cambridge three miles east of Ciudad del Maiz, San Miagrammopes mexicanus 0. P. CAMBRIDGE, 1893, Biologia Centrali-Americana, Araneidea, Luis Potosi, November 29, 1940 (A. M. I, p. 116, P1. xv, figs. 7-7d. Davis). RECORD.-TAMAULIPAS: Rio Guayalejo, This distinctive species is placed in Aris- near Forlon, April 16, 1938, one female ton with some doubt. It is distinct from (L. I. Davis and B. Brown). Ariston albicans Cambridge by the less widely separated median eyes of the pos- Ariston reticens, new species terior row which are smaller than the Figure 43 lateral eyes. MAIE.-Total length, 2.40 mm. Ariston albicans 0. P. Cambridge LENGTH WIDTH Ariston albicans 0. P. CAMBRIDGE, 1896, Carapace 0.85 mm. 0.80 mm. Front 0.20 0.50 Biologia Centrali-Americana, Araneidea, I, p. Sternum 0.56 0.46 216, Pl. XXVII, fig. 9. Labium 0.12 0.14 RECORD.-VERA CRUZ: La Buena Ven- Maxilla 0.28 0.20 tura, July, 1909, one female (A. Petrunke- Abdomen 1.65 0.80 vitch). Carapace greenish in color, uniformly flecked with dusky spots, the eye tubercles black. Labium, maxillae and sternum black. Legs pale Uloborus signatus 0. P. Cambridge yellow with a greenish tinge, the front legs al- Uloborus signatus 0. P. CAMBRIDGE, 1898, most uniformly dusky, the posterior legs with Biologia Centrali-Americana, Araneidea, I, p. black annulae. Abdomen gray above, with a 264, PI. XXXVIII, figs. 9 and 10. narrow dusky line to the median hump and dusky side markings, the caudal half of the RECORDS.-CIIAPAS: Tapachula, Au- dorsum all dusky. Venter with a broad black gust, 1909, male and immature specimens band continuous with the black under side of the (A. Petrunkevitch). La Zacualpa, August, carapace. 1909, males and females (A. Structure essentially typical. Carapace Petrunkevitch). broadly rounded in front and behind, suborbicu- VERA CRUZ: La Buena Ventura, July, lar in outline, of average height. Clypeus equal 1909, males and females (A. Petrunke- 18 AMERICAN MUSEUM NOVITATES [No. 1158 vitch). OAXACA: Palomares, July, 1909, Legs with black spines. First tibia armed above with a row of four subdorsal spines on each female (A. Petrunkevitch). side and a median row of 1-1-1-2, the pair near the apex; armed below with one or two weak Uloborus variegatus 0. P. Cambridge spines. First metatarsus with rows of short Uloborus variegatus 0. P. CAMBRIDGE, 1898, spines. First leg: femur, 1.73 mm., patella, Biologia Centrali-Americana, Araneidea, I, p. 0.55 mm., tibia, 1.50 mm., metatarsus, 1.60 266, P1. xxxviii, fig. 11. mm., and tarsus, 0.77 mm. long. Palpus as illustrated in Fig. 42. RECORD.-TAMAULIPAS: thirteen miles FEMALE.-Total length, 3.50 mm. south of Villa Juarez, April 17, 1938, one female (A. M. and L. I. Davis). LENGTH WIDTH Carapace 1.30 mm. 1. 10 mm. Front 0.22 0.57 Uloborus abstrusus, new species Sternum 0.76 0.46 Figures 41 and 42 Labium 0.16 0.22 MALE.-Total length, 3.10 mm. Maxilla 0.36 0.30 Abdomen 2.40 1.35 LENGTH WIDTH Carapace 1.42 mm. 1.23 mm. Coloration in close agreement with the male Front 0.25 0.60 when allowance is made for the usual sexual Sternum 0.73 0.50 differences in species of the genus. Carapace all Labium 0.13 0.17 black except for a narrow white band which be- Maxilla 0.24 0.20 gins well behind the posterior eye row and goes Abdomen 1.80 1.10 back to the margin. Sternum uniform black. Legs darker than in the male, the annulae black. Carapace black on the sides but with a large First leg: femur mostly black, with a narrow pale spot just above the posterior coxae on each pale ring in distal half and a pale spot at base side and with a median longitudinal pale band above and below; tibia with a narrow basal and which begins at the second row of eyes, is pro- submedian pale annulus; metatarsus and tarsus duced on each side into a point above the median black or nearly so, with a pale basal annulus. groove, and is narrowed behind the groove to Posterior legs marked as in the male. half the greatest width and continues back to Abdomen more strongly marked with black the caudal margin. Clypeus pale. Sternum above, the submedian maculation being larger, dusky, the margins with an irregular seam of and the caudal spot more extensive. Venter black spots. Coxae pale yellow, with a dusky nearly all black. ventral spot. Legs light brown, strongly annu- Structure in close agreement with the male. late in black. Femora pale above to apical dark First leg: femur, 2.10 mm., patella, 0.63 mm., ring but dusky on sides and beneath at base; tibia, 1.72 mm., metatarsus, 1.72 mm., and third and fourth femora mostly pale yellow. tarsus, 0.80 mm. long. Patellae dusky. First tibia with broad basal Epigynum as illustrated in Fig. 41. and distal black annulae, leaving only a narrow pale annulus. First metatarsus and tarsus TYPE LOCALITY.-Male holotype, fe- uniform brown. Posterior legs with narrower male allotype, and female and four im- dark annulae, the paler rings on all terminal mature paratypes from Xilitla, San Luis joints broader. Potosi, December 2, 1939 (A. M. and L. I. Abdomien gray to white, the dorsum with two indistinct black spots just in front of middle and Davis). a short divided apical maculation; sides mostly This pretty species is allied to Uloborus black; venter with a basal longitudinal dusky variegatus Cambridge with which it agrees band margined with gray. closely in coloration and structure. The Structure typical, in close agreement with Uloborus variegatus Cambridge. Clypeus equal carapace in variegatus is usually all black. in height to one and one-half times the diameter Uloborus abstrusus is best separated by the of an anterior lateral eye. First row of eyes genitalia which are illustrated. In abstrusus strongly procurved, the large median separated the openings within the excavated atrium by the radius, set on an elevated tubercle, some- are less widely separated. In the male the what more than their diameter from the lateral eyes which are about half as large. Second row principal apophysis (distal apophysis ?) of eyes gently recurved, the median separated is much longer. This species is closely re- by one and one-half their diameter, one and one- lated to Uloborus oweni Chamberlin, known fourth diameters from the subequal lateral eyes. from several islands in the Gulf of Califor- Median ocular quadrangle as broad as long, slightly narrowed in front (35/37), the anterior nia, but no specimens of that species have median eyes much larger. been available for comparison. !,1942] SPIDERS FROM MEXICO. IV 19

Uloborus americanus Walckenaer white above, reticulate with gray lines, and with, Uloborus americanus WALCKENAER, 1842, Ins. a dull maculation near the base; sides with a 229. black maculation at the base and one at distal Apt., II, p. end which encloses a white spot; venter white. RECORDS.-SAN Luis POTOSI: Rio Frio, Structure typical. Carapace broader than November 29, 1940, two females (A. M. long, convex, highest in the ocular region. Davis). Tamazunchale, September 27, First row of eyes procurved, the dark median separated by their diameter, almost touching 1939, one male, two females (C. M. Bogert the subequal white lateral eyes. Second row of and H. E. Vokes). CHAPAS: Tonala, eyes moderately procurved, the pearly white August, 1909, one male (Dr. A. Petrunke- median elongate, subtriangular, separated by vitch). their short diameter, one-third as far from the round dark lateral eyes. Median ocular quadrangle longer than broad (23/20), as broad in Oecobiidae front as behind. Sternum broadly truncated behind, the fourth coxae separated by about Oecobius vokesi, new species their width. Figure 40 Legs of average length. First leg: femur, 0.81 mm., patella, 0.32 mm., tibia, 0.60 mm., FEMALE.-Total length, 2.20 mm. Carapace, metatarsus, 0.60 mm., and tarsus, 0.47 mm. 0.75 mm. long, 0.86 mm. wide. Abdomen, 1.60 long. Tibia and patella of fourth leg, 1.00 mm. mm. long, 1.10 mm. wide. long. Carapace pale yellow, very faintly marked Epigynum as illustrated in Fig. 40. with dusky maculations as follows: two spots in front of eyes on the clypeus; an irregular TYPE LOCALITY.-Female holotype from transverse band behind the eyes; three spots on Hacienda la Oaxaquefia, thirty kilometers each side just above the margins of the pars south of Jesus Carranza, Vera Cruz, thoracica and three smaller spots just above them; margin of carapace with a narrow black October 15, 1939 (C. M. Bogert and H. E. seam. Sternum white. Legs pale yellow, Vokes). marked with black as follows: femora and tibiae This is a much paler species than Oecobius with a subbasal and a subdistal narrow black beatus Gertsch and Davis and completely ring which is incomplete above; patella with a single ring incomplete above; metatarsus with a lacks dorsal markings on the dorsum of the subbasal ring incomplete above and a broader abdomen. The median ocular quadrangle complete annulus at distal end. Abdomen is as broad behind as in front.