On a collection of Batraxis Reitter (Coleoptera: Staphylinidae: Pselaphinae) from Hainan Island, southern China Author Wang, Dan Author Yin, Zi-Wei Author Wang, Chun-Xin text Zootaxa 2016 4109 1 1 15 journal article 39133 10.11646/zootaxa.4109.1.1 4dcea233-45e7-4c56-a91c-e97d6c250262 1175-5326 258822 5AA87F55-DE88-419B-98D4-ECDC3AE09FAE Key to Batraxis males from Hainan 1 Body less than 1.4 mm ( Fig. 3 B)............................................................. B. minor sp. n. - Body more than 1.5 mm ............................................................................... 2 2 Dorsal surface of body with bushy, long pubescence ( Fig. 2 A)....................................... B. pilosa sp. n. - Dorsal surface of body shiny, glabrous or sometime with sparse, minute setae..................................... 3 3 Abdomen and elytra bicolorous ( Fig. 1 A)...................................................... B. bicolor sp. n. - Abdomen and elytra concolorous........................................................................ 4 4 Abdomen strongly narrowed at lateral margins near base ( Fig. 1 B); profemora protuberant at middle ( Fig. 5 F)..................................................................................................... B. tibialis sp. n. - Abdomen smoothly rounded basolaterally or straight; profemora lacking protuberance............................... 5 5 Mesotibiae with a sharp apical tooth ( Fig. 5 E)................................................. B. spinosas sp. n. - Mesotibiae simple.................................................................................... 6 6 Head with complete vertexal sulcus, anterior margin of vertexal sulcus merging with subantennal transverse sulcus; antennae relatively thick ( Fig. 4 A); protrochanters lacking protuberance at ventral margin ( Fig. 4 E)............... B. simplex sp. n. - Head lacking vertexal sulcus; antennae relatively thin ( Fig. 3 A); protrochanters expanded ventrally ( Fig. 5 K).................................................................................................. B. hainanensis sp. n.