The first record of Euthiconus Reitter in Japan, with comparative notes on remaining Palaearctic species (Coleoptera, Staphylinidae, Scydmaeninae)

Two species of Euthiconus Reitter were previously known to occur in the Palaearctic region, distributed in Europe (E. conicicollis (Fairmaire & Laboulbene)) and in the Russian Far East (E. lustrificus Kurbatov). A description of the first Japanese species, Euthiconus nopporoensis sp. n., is given, based on specimens collected on Hokkaido. The new species shares with E. lustrificus unmodified male protrochanters and a similar shape of the pronotum; it differs in a bottle-shaped aedeagus, sparser setae on the pronotum, and a shorter antennomere III. Key morphological structures of all Palaearctic species of Euthiconus are illustrated, to facilitate identifications.