Notes on the genus Astenus Dejean, 1833 from the Palearctic Region (Coleoptera: Staphylinidae: Paederinae)

The genus Astenus Dejean, 1833 (Coleoptera: Staphylinidae: Paederinae) contains more than 200 species in the Palearctic Region. In this paper, new and additional distributional data concerning 20 species of the genus Astenus in the Palearctic Region are presented. The studied material has been collected between 1928-2016 and also contained the types and additional specimens from some European museums. Among them nine species are first country records: Armenia (1), Azerbaijan (1), Bulgaria (2), Bosnia Herzegovina (1), France (1), Iraq (2), Israel (1), Syria (2), Kazakhstan (2), Turkey (1) and Turkmenistan (4). Besides, the original specimens of Astenus rufopacus Reitter, 1909 have been studied, the lectotype designated, the species redescribed and illustrated.