Trechus rolwalingensis, Schmidt, 2009

Schmidt, Joachim, 2009, Taxonomic and biogeographical review of the genus Trechus Clairville, 1806, from the Tibetan Himalaya and the southern central Tibetan Plateau (Coleoptera: Carabidae: Trechini) 2178, Zootaxa 2178 (1), pp. 1-72 : 61

The Trechus rolwalingensis group

Diagnosis: Head with frontal furrows deep, +/- strongly curved at middle, not flattened at level of hind suborbital pore. Frons and supraorbital areas strongly convex. Temples smooth. Mandibles relatively long. Pronotum with hind angles well produced, and with outer fifth of base more strongly curved anteriorly. Pronotal basal transverse depression diffuse limited towards disc; laterobasal foveae deeply developed. Pronotal median line distinct, deeper near base. Hind wings reduced to small stubs. Humerus broadly rounded. Each elytron with parascutellar seta, preapical seta and two discal setae on third interval, with anterior discal seta located on stria III at the end of the anterior elytral quarter, and with middle dorsal seta located on stria III somewhat behind elytral middle. Stria VIII slightly or moderately impressed from level of the fifth umbilicate pore backwards and more deeply impressed at levels of seventh and eighth pores, but often interrupted in middle between sixth and seventh pore. Recurrent elytral preapical sulcus deeply impressed and directed to the end of the seventh stria. Ventral surface smooth. Legs short, with thick femora and thin tibia and tarsi; protibiae slightly dilated towards apices, hardly bowed, without a longitudinal groove on external surface. Two basal protarsi of male dilated, dentoid at the inner apical border. Aedeagal median lobe remarkably stout, with basal bulb average and slightly bent downwards, with basal velum well developed and with terminal lamella short, not hooked at tip. Internal sac with a strongly sclerotized portion below median lobe ostium (copulatory piece); ostium densely covered with strongly sclerotized longitudinal bands. Parameres moderately short, broad at tip, with left paramere slightly longer than right one, both with four relatively short setae at tip.

Species included: Monotypic: T. rolwalingensis sp. n. (Central Nepal).