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Revision of the Genus Trachyarus Thomson SPIXIANA 30 1 65–83 München, 1. Mai 2007 ISSN 0341–8391 Revision of the genus Trachyarus Thomson (Insecta, Hymenoptera, Ichneumonidae, Alomyini) Vladimir E. Gokhman Gokhman, V. E. (2007): Revision of the genus Trachyarus Thomson (Insecta, Hymenoptera, Ichneumonidae, Alomyini). – Spixiana 30/1: 65-83 A revision of the Palaearctic genus Trachyarus is presented. This genus includes 15 described and valid species (including nine species described in this paper): Trachyarus bacillatus, spec. nov., T. decipiens, spec. nov., T. edilleri, spec. nov., T. hemichneumonoides, spec. nov., T. khrulevae, spec. nov., T. parvipennis, spec. nov., T. punctigaster, spec. nov., T. solyanikovi, spec. nov. and T. subtilipiceus, spec. nov.). Trachyarus specularis Roman is considered a junior synonym of T. anceps (Berthou- mieu). Vladimir E. Gokhman, Botanical Garden, Moscow State University, Moscow 119992, Russia; e-mail: [email protected] Introduction of Sciences, St. Petersburg, Russia; ZMMU – Zoological Museum, Moscow State University, Moscow, Russia; Trachyarus is a medium-sized Palaearctic genus of ZSM – Zoologische Staatssammlung, Munich, Ger- the tribe Alomyini (= Phaeogenini sensu Perkins many. Unless otherwise stated, all type material of 1959, Wahl & Mason 1995). The genus and its type newly described species is deposited in the ZSM collec- tion. species were described at the end of the nineteenth century (Thomson 1891). However, it is poorly known although several other species now belong- Genus Trachyarus Thomson ing to Trachyarus were discovered since that time (Berthoumieu 1906, Roman 1918, Diller 1988, 1989). Trachyarus Thomson, 1891: 1612. The examination of the extensive material from col- lections of the Zoologische Staatssammlung (Munich, Type species. Trachyarus corvinus Thomson, 1891: Germany), Zoological Institute, Russian Academy 1612, by monotypy. of Sciences (St. Petersburg, Russia), and the Zoo- logical Museum of the Moscow University (Moscow, Description Russia) resulted in the discovery of several new Female. Head conspicuously inflated. Clypeus species. Moreover, a revision of Trachyarus is neces- strongly convex, well separated from the face. sary because of the considerable intraspecifi c varia- Lower edge of the clypeus thin, usually more or less tion in this genus, especially regarding wing struc- rounded, with an apical margin. Clypeus about twice ture. as wide as high. Face about twice as wide as high, median part rising above the lateral ones. Antennal Abbreviations used: MNHN – Muséum National D’Histoire Naturelle, Paris, France; NHM – Natural scrobe weak. Frons obviously convex. Head trans- History Museum, London, UK; NHRM – Naturhistor- verse, sometimes narrowed behind eyes in dorsal iska Riksmuseet, Stockholm, Sweden; UZI – Museum view. Temples usually enlarged in profi le, with their of Zoology and Entomology, Lund University, Lund, maximum length somewhat equal to transverse Sweden; ZIN – Zoological Institute, Russian Academy ocular diameter. Malar space more or less equal to 65 width of mandibular base. Scape oviform, its apical Biology. All known hosts belong to Psychidae truncation inclined. Maximum length of the scape (Lepidoptera). slightly exceeds its width. Flagellum fi liform, with Differential diagnosis. Members of a few genera 21-27 segments. Mandibles sometimes narrowed, of the tribe Alomyini, namely those of Hemichneumon their upper tooth longer or shorter than the lower Wesmael, Epitomus Förster and Tycherus Förster tooth. (fuscicornis species group), are closest to Trachyarus. Mesoscutum convex. Scutellum distinctly con- Species of Trachyarus (as well as those of Hemichneu- vex, its lateral carinae usually very short. Sternauli mon and Epitomus), however, differ from Tycherus stretch almost to the middle of mesopleura. Propo- by having areolet of the fore wing open, its occlud- deum formed by weakly inclined short basal part ing vein spectral; from Epitomus – by having propo- and strongly inclined long apical one (except T. bra- deum sloping from anterior margin of area supero- chypterator and T. khrulevae). Area basalis of propo- media; from Hemichneumon – by having large thy- deum short and indistinct. Area superomedia heart- ridia, rugose mesopleura and short but distinct area shaped, narrowed basally, separated from area superomedia of the propodeum; the former area is posteromedia by weak and indistinct carina. Area often separated from area posteromedia by more or petiolaris bordered by weak diverging carinae, wide, less developed carina (see Selfa & Diller 1994). distinctly concave. Side carinae of area posteromedia hardly visible and very indistinct, sometimes absent. Wings fully developed or reduced. Areolet open, its 1. Trachyarus anceps (Berthoumieu) occluding vein spectral. Second recurrent vein with Figs 1, 2 2 bullae. Nervellus usually vertical. Coxal armature absent. Hemichneumon anceps Berthoumieu, 1906: 60. Holotype: Metasoma oval to longish-oval. Petiolus more W, France, “Val d’Isère” (MNHN, studied). or less compressed dorsoventrally. Thyridia often Trachyarus anceps: Diller, 1989: 288. wide and slightly inclined. Protruding part of the Trachyarus specularis Roman, 1918: 8. Lectotype: W, Swe- ovipositor sheath very short. Sterna of metasomal den, “Lapp. suecica merid.” (NHRM, designated here, segments II-IV with a median fold. Hypopygium selected by E. Diller). Syn. nov. short, far from overlapping the ovipositor slit. Material. 12WW, 6MM (MNHN, NHRM, ZIN, ZSM) in- Body weakly to moderately sculptured. Head cluding holotype (W, France, “Val d’Isère”, “type”, “Hem- shining, side parts of face more or less densely ichneumon anceps n. sp. (Berth. vid.)”, “Museum Paris”, punctate, punctures of the median part of the face “Holotypus Hemichneumon anceps Berth. W Diller 89”, fi ner, clypeus fi nely punctate. Frons with fi ne scat- “Trachyarus anceps (Berth.) W det. E. Diller 89”, “montage tered punctures. Temples very sparsely and fi nely sur Polypore le 23.III.1989 M. Lachaise”) (MNHN). – punctate. Malar space with a chagrinate groove. Paratypes: 12WW, 6MM, same data. Mesoscutum and scutellum usually shining, the Additional material. Two females and a male reared in former with comparatively dense and fi ne punctures, the Moscow region from Siederia spp. (including S. lis- the latter more sparsely punctate. Mesopleura usu- terella; ZIN) probably also belong to this species. ally rugose, speculum more or less smooth. Propo- deum rugose (areae superoexternae less sculptured). Differential diagnosis. The female of T. anceps is Base of metasoma usually chagrinate, sculpture closest to that of T. brevipennis, but in T. anceps the disappears towards apex of metasoma. fl agellum is more slender (fi rst fl agellar segment Body usually brown. Head brown, clypeus, 3.6-4.0 × as long as wide) and the metasomal sculp- median part of face and mandibles usually lighter. ture is less developed (especially on tergum III). Antennae brown to reddish brown, palps light Among Trachyarus males, T. anceps is the only species brown. Thorax brown. Stigma and veins reddish. having a combination of the following characters: Legs predominantly brown. Metasoma usually upper mandibular tooth longer than the lower tooth; brown with hind margins of terga II-III yellowish fl agellum without tyloids; metasomal tergum III and tergum VII reddish brown. 1.6-1.7 × as wide as long, its apical half smooth with Body length 3.5-6.0 mm, fore wing length 0.3- obscure punctures. 4.3 mm. Note. Another species of the genus, Trachyarus Male. Similar to female. Tyloids, if developed, specularis Roman, appeared to be a synonym of oval, usually present before the middle of fl agel- T. anceps. Contrary to Diller (1988: 371), this species lum. is not a synonym of T. fuscipes (lectotypes com- pared). Distribution. Palaearctis. 66 2 3 4 5 6 1 7 8 10 9 11 Figs 1-11. Trachyarus spp., WW. 1, 3. Base of fl agellum. 1. T. anceps (Berthoumieu). 3. T. brevipennis Roman. 2. T. an- ceps, mandible. 4-6, 8-11. Metasomal terga II and III. 4. T. corvinus Thomson. 5. T. fuscipes (Thomson). 6. T. prominu- lus Diller. 8. T. edilleri, spec. nov. 9. T. hemichneumonoides, spec. nov. 10. T. parvipennis, spec. nov. 11. T. solyanikovi, spec. nov. 7. T. bacillatus, spec. nov., mandible. – Scale equals 0.25 mm for Figs 1-3, 7 and 0.5 mm for Figs 4-6, 8-11. Description fi nely and sparsely punctate. Upper halves of the pronotal lobes shining, with fi ne scattered punctures, Female. Lower edge of the clypeus very slightly the lower ones longitudinally rugose. Mesopleura rounded, apical margin hardly visible. Head slight- almost smooth to rugose-punctate, sometimes only ly narrowed behind eyes in dorsal view. Temples in their apical half, speculum smooth with a few more or less enlarged ventrad. Flagellum slightly very fi ne punctures. Metasomal tergum I coarsely enlarged in apical half, with 23-26 segments, fi rst punctate, postpetiolus irregularly longitudinally segment 3.6-4.0 × as long as wide (Fig. 1), 12th or 13th striate, tergum II and sometimes basal fourth of segment square in lateral view. Mandibles somewhat tergum III obviously chagrinate, with obscure punc- narrowed, upper mandibular tooth distinctly long- tures, the others sparsely punctate, sculpture almost er than the lower tooth (Fig. 2). Hypostomal carina disappears towards apex of metasoma. meets genal carina before the mandibular base at Body brown. Head brown, clypeus and some- half its width. times cheeks and most part of face lighter, mandibles Distinct notauli present in the basal third of (except
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