A revision of the genus Xanthopygus Kraatz (Staphylinidae: Xanthopygina).

The genus Xanthopygus Kraatz 1857 sensu Chatzimanolis 2021 is revised and the distributional records for all species are updated. Lampropygus giganteus Bernhauer is shown to be a junior synonym of Staphylinus luctuosus Blanchard. Neotypes are designated for Belonuchus pexus Motschulsky and Xanthopygus oliveirae Lynch. Lectotypes are designated for Lampropygus major Bernhauer, Staphylinus xanthopygus Nordmann and Xanthopygus cacti Horn. Lampropygus giganteus Bernhauer is designated as the type of the subgenus Heteropygus Bernhauer, since the type designation by Blackwelder was invalid. Illustrations and a key are provided for all species in Xanthopygus.