Notes on Prosthecarthron Raffray, with description of P. insulanus, sp. n. (Coleoptera, Staphylinidae, Pselaphinae) from Qi’ao Island, South China Author Yin, Zi-Wei Author Huang, Shao-Bin Author Gu, Fu-Kang text Zootaxa 2012 3530 83 88 journal article 10.5281/zenodo.212049 41397f54-0b5d-4dd4-b74b-258f6655daa2 1175-5326 212049 Prosthecarthron insulanus Yin and Huang , new species ( Figs 1 A, 2, 3) Type-locality. South China : Guangdong Province, Zhuhai City, Qi’ao Island , 22°25ʹ12.43ʺN, 113°38ʹ0 5.39ʺE, 5 m a.s.l. Type material (31 33). Holotype : CHINA : 3, labeled ‘ China : Guangdong / Zhuhai, Qi’ao Island / mangrove forest / 3.vi.2012 (light trap) / Shao-Bin Huang leg. // HOLOTYPE [red] / Prosthecarthron insulanus sp. n. / Yin & Huang / det. 2012, SNUC’. Paratypes : CHINA : 30 33, same label data as holotype , with the following paratype label: ‘ PARATYPE [yellow] / Prosthecarthron insulanus sp. n. / Yin & Huang / det. 2012, SNUC’. Description. Male. Length 1.94–2.07; body ( Fig. 1 A) reddish brown, maxillary palpi and tarsi lighter; densely covered with short pubescence. Head transverse, wider than long, HL 0.39–0.40, HW 0.45–0.46. Eyes each composed of about 35 large facets. Antennal club loosely three-segmented, segment V ( Fig. 2 A) strongly modified. Pronotum rounded laterally, wider than long, PL 0.42–0.45, PW 0.48–0.49. Elytra wider than long, EL 0.59–0.62, EW 0.74–0.78. Protrochanters ( Fig. 2 B) spinose on ventral margins; protibiae with small apical tubercle; mesotrochanters ( Fig. 2 C) with small ventral tubercle, mesotibiae with large apical spur; metatrochanters ( Fig. 2 D) with blunt ventral tubercle; metatibiae broadly expanded mesally and serrate ( Fig. 2 E) on mesal margin near middle. Abdomen about same width as elytra, AL 0.54–0.60, AW 0.68–0.71; tergite IV as long as next two segments combined; tergite VIII ( Fig. 2 F) and sternite VIII ( Fig. 2 G) transverse; sternite IX ( Fig. 2 H) paired. Aedeagus ( Fig. 2 I) length 0.31, well-sclerotized, median lobe narrowed apically. Female. Unknown, probably with simple antennae and legs. Distribution. Presently known only from the type locality in Guangdong ( Fig. 3 ). Biology. Individuals were collected by a light trap set near a mangrove forest. FIGURE 1. Dorsal habitus of P . insulanus ( 1 ) and P . sauteri ( 2 ). Scales: 0.5 mm. FIGURE 2. Diagnostic features of P . insulanus . A . Antennal modification. B . Proleg. C . Mesoleg. D . Metaleg. E . Metatibia, enlarged. F . Male tergite VIII. G . Male sternite VIII. H . Male sternite IX. I . Aedeagus, in dorsal view. Scales: A–E = 0.2 mm, F–I = 0.1 mm. Comparative notes. The new species is closely related to P . sauteri in sharing a nearly identical antennal modification in the male. The two species can be readily separated by the mesotibiae with a long apical spur on the mesal margin and the metatibiae with serrate mesal margin near the middle in P . insulanus . Prosthecarthron sauteri has the mesotibiae lacking an apical spur and the metatibiae are smooth on the mesal margin. The other species of the genus, P . frontalis , differs from both P . insulanus and P . sauteri by the frons with a large cavity in the male. Etymology. The Latin word ‘ insulanus ’ means ‘an inhabitant of an island’, indicating the new species was taken from an island.