Note on the subgenus Pseudotrichotichnus of the genus Trichotichnus from Southeast Asia (Coleoptera: Carabidae: Harpalini) Author Ito, Noboru text Acta Entomologica Musei Nationalis Pragae 2009 2009-12-15 49 2 599 606 journal article 4642 10.5281/zenodo.5320906 f33526c4-a22f-4c32-9fd9-34a1255f44eb 0374-1036 5320906 Trichotichnus ( Pseudotrichotichnus ) vietnamensis sp. nov. ( Figs. 3 , 6 ) Type material. HOLOTYPE : J, ‘ Mt. Pia Oac , alt. 1,200m , Cao Bang Prov. , N. Vietnam , 23.V.1999 , S. Uéno leg.’ ( NMNS ) . PARATYPES : 2 ♀♀ , same data as the holotype ; 2 JJ 1 ♀ , ‘ Sa Pa , alt. 1,550 m , Lao Cai Prov. , 10.V.1995 , S. Uéno leg. ’; 1 J, ‘ Tam Dao , alt. 960 m , N. Vietnam , 22.IV.1995 , S. Uéno leg.’ ( NMNS , NIKJ ), 1 ♀ , the same locality, 15.V.1995 ; 2 JJ 3 ♀♀ , the same locality, ‘ 22.IV.1995 , S. Uéno leg. ’; 1 ♀ , the same locality, alt. 930m , 21.IV.1995 ’; 2 ♀♀ , the same locality, ‘alt. 900m , 16.–23.IV.1991 , Strnad Jan leg.’ ( HNHM ) ; 1 ♀ , ‘ Da Lat , Vietnam , 20.IV.1989 , F. Schmidt leg.’ ( DWBG ) . Description. Body oblong, fairly convex, pitchy black though a little lighter than in T . miyakei , strongly shiny, iridescent on elytra; palpi, antennae, tarsi and tibiae light reddish brown, femora brown to blackish brown. Head rather large, 0.71–0.74 times as wide as pronotum, gently convex, very sparsely and microscopically punctate; labrum subquadrate, triangularly emarginate apically; clypeus transversely elevated, shallowly emarginate at apex; clypeal suture very weakly curved, deep even in middle, more strongly deepened at sides; frontal impressions as deep as clypeal suture at sides, obliquely linear; eyes large, well convex; temples steeply inclined, rather long, one-third the eye length; genuine ventral margin of eyes widely isolated from buccal fissure; antennae short, hardly reaching pronotal base, segment 3 pubescent in apical half, as long as segment 4 and 1.5 times as long as segment 2; labial palpi moderately thick, segment 3 as long as segment 2; ligula slim, slightly thickened apicad; paraglossae narrow, prolonged forwards beyond ligula; mentum with median tooth small and triangular, epilobes not widened apicad; microsculpture mostly invisible in 80× magnification. Pronotum almost quadrate, widest at apical third, 1.4 times as wide as long, so widely convex that lateral furrows are linearly impressed; sides weakly curved between anterior margin and midlength, obliquely linear elsewhere; anterior margin weakly emarginate, straight in middle, without border in narrow middle area; base with broken border; anterior angles widely arcuate; basal angles obtuse, very narrowly rounded; basal foveae flattened, each with shallow groove; front transverse impression very shallow, hind one also shallow; disc smooth, punctation absent or sparse anteriorly, coarse and moderately dense in basal foveae; microsculpture largely consisting of transverse meshes, and of isodiametric meshes near basal punctures. Elytra oblong, weakly oval, 1.30 times as wide as pronotum, a little less than 1.50 times as long as wide, evenly convex, very sparsely and microscopically punctate; sides subparallel near midlength, abruptly and arcuately curved posteriorly; apices widely rounded at sides, with tips close to each other; base of each elytron shallowly emarginate, forming rounded angle with lateral margin; striae as in T . ( P .) jelineki sp. nov. ; intervals gently convex, becoming more convex towards apex and base, discal pore of interval 3 situated between apical third and two-fifths; marginal series widely interrupted medially, composed of 8 + 10 umbilicate pores; microsculpture consisting of fine and obscure transverse lines. Hind wings well developed. Ventral surface largely impunctate, very sparsely and minutely punctate on lateral areas of metasternum; metepisterna convergent posteriorly, nearly 1.5 times as long as wide; abdominal sternite 6 sparsely pubescent, with two setae at each side in both sexes, apex truncate or feebly emarginate in male and narrowly rounded in female. Fore tibiae a little more widened apicad than in T . miyakei , sulcate in basal four-fifths, terminal spur expanded in basal third; hind tarsi 0.70–0.74 times as long as the width of head in male and 0.65–0.69 times as long in female, segment 1 0.9 times as long as segments 2 and 3 combined and 1.65 times as long as segment 2, segment 3 1.5 times as long as segment 4, all claws with two setae on outer margin and three setae on inner margin of ventral surface. Aedeagus ( Fig. 6 ) similar in shape to T . jelineki sp. nov. , though less stout, with a little smaller basal bulb; apical orifice widely opened, inner sac not bearing spinose sclerites but with clusters of microtrichia near middle; apical lobe short, thickened at tip. Body length: 8.8–10.2 mm ; body width: 3.6–4.2 mm . Differential diagnosis. This new species is similar to T . miyakei , but the body is smaller, the legs are paler and the aedeagus bears smaller basal bulb and narrow apical orifice armed with clusters of microtrichia ( Fig. 6 ). Etymology. The species name is derived from country of type locality. Distribution. Vietnam .