Revision of Korean Diaulota Casey (Coleoptera: Staphylinidae: Aleocharinae) with description of a new species

The Korean Diaulota Casey is revised, including a new species ( Diaulota lepadea Ahn and Yoo, new species). The new species and D. decipiens Tasaku, Ono and Maruyama have been incorrectly identified as D. aokii Sawada and D. pacifica Sawada, respectively, for a long time along Korean coasts. They are redescribed with illustrations of diagnostic characters. Rotundicephala Tasaku, Ono and Maruyama is synonymized under Diaulota . A brief taxonomic history, key, distributional map, and comparison table among Korean Diaulota species are presented.