Descriptions of Three New Species of the Genus Stenus LATREILLE (Coleoptera, Staphylinidae), with Notes on Synonyms and New Records from Japan

Three new staphylinid beetles of the subgenus Nestus are described : Stenus satushin from Ehime Pref., Shikoku, S. ochiba from Nagano and Hiroshima Prefs. and S. toukin from Aichi Pref. Stenus gatenpio NAOMI, 1990 a, is placed in synonymy with S. lewisius SHARP, 1874 ; S. niponensis CAMERON, 1930 with S. japonicus SHARP, 1874 ; S. sasajii NAOMI, 1988 a with S. puberulus SHARP, 1874 ; S. nomurai NAOMI, 1988 a with S. mikado HROMADKA, 1979 ; S. jambar NAOMI, 1990 b with S. punctifer NAOMI, 1988 b ; S. guttalis ishigakiensis NAOMI, 1988 b with S. guttalis FAUVEL, 1895. Stenus amurensis EPPELSHEIM, 1886, S. boops LJUNGH, 1804, and S. raddei RYBKIN, 1987 are first recorded from Japan (Hokkaido). Stenus mammops CASEY, 1884 is first recorded from the main island of Hokkaido.