Taxonomic notes on the genus Nomuraius Hlaváč (Staphylinidae: Pselaphinae) Author Yin, Zi-Wei Department of Biology, College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road., Xuhui District, Shanghai, 200234, P. R. China. Author Li, Lizhen Department of Biology, College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road., Xuhui District, Shanghai, 200234, P. R. China. pselaphinae@gmail.com text Revue suisse de Zoologie 2013 2013-12-31 120 4 563 573 journal article 230909 10.5281/zenodo.7560404 95dd82fb-b63c-41cf-b40c-39d13e9363bb 0035-418X 7560404 Nomuraius sinicus Yin & Li new spec. Figs 1B , 3 , 6 HOLOTYPE : ♂ , labelled ‘ CHINA : Guangxi , Shangsi County / Shiwandashan Forest Park , / 21°54′11″N , 107°54′14 E / ca. 325 m , mixed leaf litter, sifted / 25.iv.2011 , Peng & Zhu leg. // HOLOTYPE [red] / Nomuraius sinicus / sp. n., Yin & Li / det. 2013, SNUC’ . PARATYPE : 1 ♀ , same label data as holotype, except ‘PARATYPE [yellow] / Nomuraius sinicus / sp. n., Yin & Li / det. 2013, SNUC’ . DIAGNOSIS: Length 2.89-3.01 mm . Male: maxillary palpomeres II shortly projecting laterally; head slightly concaved along posterior margin; pronotum with apical portion covered with tufts of setae; protibiae with short apical spur; metatibiae slightly roundly expanded medially near apices. DESCRIPTION Male ( Fig. 1B ). Length 3.01 mm . Head longer than wide, HL 0.65 mm , HW 0.56 mm , posterior margin slightly concaved; eyes each composed of about 30 facets. Antennal clubs as in Fig. 3A . Pronotum ( Fig. 3B ) slightly longer than wide, PL 0.66 mm , PW 0.62 mm , apical portion covered with sparse setose tufts; punctiform median- and lateral antebasal foveae small. Elytra wider than long, EL 0.85 mm , EW 1.08 mm . Long metaventral processes with bluntly rounded apices ( Fig. 3C ). Trochanters and femora ( Figs 3D, F, G ) simple; protibiae ( Fig. 3E ) with short apical spur; metatibiae slightly roundly expanded medially near apices ( Fig. 3H ). Abdomen broad at base and narrowed apically, AL 0.85 mm , AW 1.00 mm. Tergite VIII ( Fig. 3I ) about as long as wide; sternite VIII ( Fig. 3J ) slightly transverse, sternite IX as in Fig. 3K . Aedeagus length 0.51 mm , with symmetric median lobe apically bent leftwards ( Figs 3 L-N). Female : Measurements: BL 2.89 mm , HL 0.65 mm , HW 0.55 mm , PL 0.60 mm , PW 0.59 mm , EL 0.77 mm , EW 1.06 mm , AL 0.87 mm , AW 1.09 mm . Eyes each compose of about 20 facets. Head, pronotum, protibiae and metatibiae simple; maxillary palpomeres II similar to those in male. DISTRIBUTION AND NATURAL HISTORY: This species is known only from the type locality. The adults were sifted from mixed leaf litter in a broad-leaved forest. COMPARATIVE NOTES: The new species is most closely allied to N. vietnamicus in sharing a similar habitus and male features. Externally, the two species can be separated from several subtle differences. Nomuraius sinicus has relatively slightly longer pronotum and elytra, has basal half of the mesofemora covered with long setae at ventral margins, and the metatibiae are relatively less expanded medially near the apices. In contrary, N. vietnamicus has relatively shorter pronotum and elytra, has the mesofemora covered with normal setae basoventrally, and the metatibiae are more distinctly expanded medially near the apices. The differences on the genital segments of the two species are more distinct, viz. N. sinicus has the tergite VIII nearly as long as wide, and has the aedeagal median lobe bent leftwards at the apex, while N. vietnamicus has distinctly transverse tergite VIII, and has the apical portion of the aedeagal median lobe being slenderer and bent rightwards. ETYMOLOGY: The specific name refers to the county where the species was found.