Taxonomy of the genus Diochus Erichson, 1839 (Coleoptera: Staphylinidae, Staphylininae, Diochini) in China with descriptions of four new species Author Zhou, Yu-Lingzi Author Zhou, Hong-Zhang text Zootaxa 2016 4127 1 1 30 journal article 38763 10.11646/zootaxa.4127.1.1 db6f243f-e978-4982-bcee-25585027488c 1175-5326 258266 9E858916-3F3A-4D87-B987-B62CE241CED0 Key to species of the genus Diochus Erichson recorded from China 1 Left mandible with blunt teeth ( Fig. 10 H); body small, not longer than 3 mm ; protarsi not dilated ( Fig. 10 L); distribution in China not confirmed................................................................. D. pulchellus Cameron - Left mandible with sharp teeth; body usually longer than 3 mm ; protarsi dilated ( Fig. 4 M)............................ 2 2 Antennomere II obviously shorter than III ( Fig. 4 G).......................................................... 3 - Antennomere II slightly shorter than (or subequal in length to) III ( Fig. 5 G)....................................... 5 3 Body large, ca. 6.0 mm; head length 1.2 times longer than width; distribution in China not confirmed.. D. japonicus Cameron - Body medium sized, ca. 5.1 mm ; head length 1.3-1.4 times longer than width...................................... 4 4 Right mandible with a long and sharp tooth ( Fig. 9 J); aedeagus not well-sclerotized, with paired stick-like apical sclerites ( Fig. 9 E-G); distribution in China not confirmed........................................... D. conicollis (Motschulsky) - Right mandible with a smaller and not very sharp tooth ( Fig. 4 J); aedeagus well-sclerotized, with paired horn-like apical scler- ites ( Fig. 4-1 E, F).................................................................... D. bicornutus sp. nov. 5 Body small sized, 3.3 mm ; aedeagus with T-shaped internal sclerite ( Fig. 8 ); distribution in China not confirmed........................................................................................ D. antennatus (Motschulsky) - Body slightly longer than 3.4, or distinctly longer (ca. 4 mm ); aedeagus without distinct sclerite....................... 6 6 Head not possessing a median elevation between eyes.................................... D. membranaceus sp. nov. - Head possessing a median elevation between eyes ( Fig. 1 , medial elevation)....................................... 7 7 Gular sutures deep and confluent before base ( Fig. 6 D).................................... D. bisegmentatus sp. nov. - Gular sutures normally deep and not confluent before base ( Fig. 5 D).......................... D. ampullaceus sp. nov.