Key points are not available for this paper at this time.
A total of 23 species of the genus Tachinus Gravenhorst, 1802 (Coleoptera: Staphylinidae: Tachyporinae) in Japan are identified from collections around the world. They are listed with detailed collecting data. Tachinus (Tachinus) dujieae sp. nov. is described from Japan: Honshu: Nagano Prefecture, illustrated, and compared with its relative, T. (Tachinus) rishirianus Watanabe & Shibata, 1965. Tachinus (Tachinoderus) aokii Hayashi & Yoshida, 2016 is synonymized with T. (Tachinoderus) diminutus Sharp, 1888. Tachinus (Tachinus) kabakovi Veselova, 1990 is recorded from Japan for the first time from. We also record some species from islands where they were previously unrecorded for the first time: T. (Tachinoderus) kobensis Cameron, 1933 from Hokkaido, Izu-shotô, and Gotô-rettô, T. (Tachinoderus) yamato (Hayashi, 2003) from Shikoku and Kyushu, T. (Tachinus) bidens Sharp, 1888 from Rishiri-tô, and T. (Tachinus) nakanei Ullrich, 1975 from Tsushima.
HASHIZUME et al. (Sun,) studied this question.