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 Orphnebius bakeri BERNHAUER, 1929 ( Figs 4, 26 , 223–225 ) Material examined : Indonesia : 1 ♂ , 1 ♀ , Borneo , Kalimantan Tengah , confluence of Busang and Rekut , 0°03'S , 113°59'E , flight interception trap , VIII.2001 , leg. Brendell & Mendel ( BMNH ) . Comment : Orphnebius bakeri is the type species of the subgeneric name Mesocephalobius BERNHAUER, 1929 , which was synonymized with Orphnebius by PACE (2007) and revalidated by HLAVÁČ et al. (2011) . The original description is based on type material from Singapore . PACE (2007) designated a lectotype and illustrated the median lobe of the aedeagus. Redescription : Body length 4.0– 4.2 mm ; length of forebody 1.7 mm . Coloration: head blackish; pronotum blackish-brown; elytra brown, with the postero-lateral portions slightly and diffusely darker; abdomen palereddish; legs dark-yellowish; antennae blackish, with antennomeres I–IV reddish; maxillary palpi yellowish. Head ( Fig. 26 ) of transversely oval shape; posterior angles obsolete; dorsal surface with scattered very fine punctures laterally; median and posterior dorsal portions extensively impunctate; interstices without microsculpture. Eyes large, reaching posterior margin of head, much longer than distance from posterior margin of eye to posterior constriction of head in dorsal view. Antenna ( Fig. 4 ) 1.1–1.2 mm long, distinctly incrassate and asymmetric; antennomere IV small and weakly transverse; antennomere V much larger than IV and asymmetric; V–X of gradually increasing width, increasingly transverse, and increasingly asymmetric; XI approximately as long as the combined length of VIII–X. Pronotum ( Fig. 26 ) 1.2 times as broad as long and 1.00– 1.05 times as broad as head, broadest near anterior angles, strongly convex in cross-section; posterior angles weakly marked; disc with a median pair of punctures and some punctures near lateral margins, otherwise impunctate. Elytra ( Fig. 26 ) approximately 0.8 times as long as pronotum; punctation sparse and fine; pubescence long, pale, and sub-erect. Hind wings fully developed. Metatarsomere I slightly shorter than the combined length of II and III. Abdomen: tergite VII with dense, oblong, non-setiferous punctation in posterior three-fourths, near posterior margin with six oblong tubercles, posterior margin with palisade fringe; tergite VIII and sternite VIII with convex posterior margins. ♂ : segments IX–X distinctly modified (of the O. hauseri type ), with dense and long pubescence; median lobe of aedeagus ( Fig. 223 ) conspicuously large and massive, approximately 1.0 mm long, with small ventral process of distinctive shape; internal sac with several small, strongly sclerotized structures; parameres ( Fig. 224 ) much shorter than median lobe, approximately 0.55 mm long; condylite very slender and slightly longer than paramerite. ♀ : spermatheca ( Fig. 225 ) strongly sclerotized and with long proximal portion. Comparative notes : This species is characterized particularly by the distinctive male sexual characters. Distribution : Orphnebius bakeri is currently known from Singapore and Borneo ( Malaysia : Sabah ; Brunei ) ( BERNHAUER 1929 , PACE 2007 , and material examined).