On some Lomechusini of the Palaearctic and Oriental regions (Coleoptera: Staphylinidae: Aleocharinae) Author Assing, Volker text Beiträge Zur Entomologie = Contributions to Entomology 2016 2016-12-20 66 1 13 111 https://www.contributions-to-entomology.org/article/view/1904 journal article 2419 10.21248/contrib.entomol.66.1.13-111 d2933fad-1cac-4a5a-a558-2633f8314541 0005-805X 6421171 Rabdotodrusilla pectinata spec. nov. ( Figs 123–125 , 380–383 ) Type material : Holotype ♂ : “ Thailand – Chiang Mai , Doi Suthep 1120 m . Barber F. I.86 , P. Schwendinger / Holotypus ♂ Rabdotodrusilla pectinata sp. n. , det. V. Assing 2015” ( MHNG ). Paratype ♂ [damaged]: same data as holotype (cAss) . Etymology : The specific epithet is an adjective derived from the Latin noun pecten (comb) and alludes to the shape of the posterior margin of tergite VIII. Description : Body length 4.2 mm ; length of forebody 1.8 mm . Coloration: head and pronotum dark-brown; elytra pale-brown with the postero-lateral portions extensively dark-brown; abdomen pale reddish-brown with segment VI infuscate; legs yellowish, with the tibiae infuscate; antennae brown with antennomeres I–II and the apex of XI paler; maxillary palpi yellowish-red with yellowish palpomere IV. Head ( Fig. 123 ) transverse, approximately 1.17 times as broad as long; punctation rather sparse and fine; pubesence long, pale, and depressed to sub-erect. Eyes large, longer than distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 124 ) rather massive, 1.5 mm long; antennomere I stout, barely twice as long as broad; II short, distinctly less than twice as long as broad; III nearly twice as long as II and more than twice as long as broad; IV very weakly transverse; V–X gradually increasing in width and increasingly transverse; IX–X more than 1.5 times as broad as long; XI nearly as long as the combined length of VIII–X. Pronotum ( Fig. 123 ) approximately 1.07 times as broad as long and 1.1 times as broad as head; posterior margin obtusely produced in the middle; disc matt and with dense, long, and straight longitudinal striae in posterior three-fourths, anteriorly and in antero-lateral portions more glossy and with granulose punctation. Elytra ( Fig. 123 ) approximately 0.8 times as long as pronotum; punctation very fine and dense. Hind wings present. Metatarsomere I approximately as long as the combined length of II–III. Abdomen ( Fig. 125 ) narrower than elytra; tergites III– VII each with a row of setiferous punctures at posterior margin, otherwise nearly impunctate, without microsculpture; posterior margin with palisade fringe. ♂ : tergite VIII ( Fig. 382 ) transverse, posterior margin with a pronounced lateral tooth-like projection on either side, between these projections with 15 conspicuous spine-shaped processes (somewhat resembling a comb); sternite VIII ( Fig. 383 ) transverse and with weakly convex posterior margin; median lobe of aedeagus ( Figs 380–381 ) approximately 0.55 mm long, with internal structures of distinctive shapes. ♀ : unknown. Comparative notes : This species is readily distinguished from R. malaysiensis by several external characters alone, particularly its larger body size ( R. malaysiensis : 2.7 mm ), much more massive antennae with transverse antennomeres IV–X ( R. malaysiensis : antennomeres IV–IX oblong), the different coloration of the femora ( R. malaysiensis : bicoloured, brown with yellow bases), and the absence of microsculpture on the elytra and the abdomen. For illustrations of R. malaysiensis see PACE (2013) . Distribution and natural history : The type locality is situated in Doi Suthep, North Thailand . The specimens were collected with pitfall traps at an altitude of 1120 m .