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 piaoacus Yin & Li , new spec. Figs 1A , 2 , 6 HOLOTYPE : ♂ , labelled ‘ Mt. Pia Oac ( 1,250 m ) / Cao Bang Prov. / [ N-VIETNAM ] / 19.v.2000 / S. Nomura leg. // HOLOTYPE [red] / Nomuraius piaoacus / sp. n., Yin & Li / det. 2013, pcPH’. DIAGNOSIS: Length 2.82 mm . Male: maxillary palpomeres II shortly projecting laterally; posterior half of head and anterior portion of pronotum strongly modified with large cavity and setose tufts, respectively; protibiae with distinct thin apical spur; metatibiae simple, not expanded medially near apices. DESCRIPTION Male ( Fig. 1A ): Length 2.82 mm . Head slightly wider than long, HL 0.52 mm , HW 0.56 mm , posterior half with large, deep cavity; eyes each composed of about 35 facets. Antennal clubs as in Fig. 2A . Pronotum ( Fig. 2B ) about as long as wide, PL 0.61 mm , PW 0.59 mm , apical portion modified with distinct median projection covered with dense setose tufts apically; distinct median- and lateral antebasal foveae round. Elytra wider than long, EL 0.84 mm , EW 1.02 mm . Long metaventral processes with apices curved anteriorly at apices ( Fig. 2C ). Trochanters and femora ( Figs 2D, F, G ) simple; protibiae ( Fig. 2E ) with thin apical spur; metatibiae simple near apices ( Fig. 2H ). Abdomen broad at base and narrowed apically, AL 0.85 mm , AW 1.00 mm. Tergite VIII ( Fig. 2I ) and sternite VIII ( Fig. 2J ) transverse, sternite IX as in Fig. 2K . Aedeagus length 0.56 mm , with symmetric median lobe apically bent rightwards ( Figs 2 L-N). FIG. 1 Male habitus of Nomuraius Hlaváč. (A) N. piaoacus sp. n. (B) N. sinicus sp. n. Scales: 1 mm. Female : Unknown. DISTRIBUTION AND NATURAL HISTORY: The new species is currently known only from the type locality ( Fig. 6 ). The single specimen was probably sifted from leaf litter from forest floor like the other congeners. FIG. 2 Male diagnostic features of Nomuraius piaoacus sp. n. (A) Antenna. (B) Pronotum. (C) Metaventral process, in lateral view. (D) Protrochanter and profemur. (E) Apical portion of protibia. (F) Mesotrochanter and mesofemur. (G) metatrochanter and metafemur. (H) Apical portion of metatibia. (I) Tergite VIII. (J) Sternite VIII. (K) Sternite IX. (L) Aedeagus, in dorsal view. (M) Same, in lateral view. (N) Same, in ventral view. Scales [mm]: A, B, D, F, G = 0.3; C, I, J, L, M, N = 0.2; H, K = 0.1, E = 0.05. COMPARATIVE NOTES: Nomuraius piaoacus can be easily separated from the other congeners by the strongly modified head and pronotum, and the simple metatibiae in the male. Both N. sinicus new spec. (described below) and N. vietnamicus have slightly modified head and pronotum, and have the metatibiae with apical portion more or less expanded medially near the apices. ETYMOLOGY: The specific epithet is derived from the type locality, Pia Oac Mountain.