Review of the Thinodromus circulus species group (Coleoptera: Staphylinidae: Oxytelinae)

The Thinodromus circulus species group is revised and five species are recognized within it. Lectotypes are designated for Thogophloeus circulus Bernhauer, 1922, T chagosanus Bernhauer, 1922, T palustris Bernhauer, 1922 and T arcitenens Fauvel, 1905; Thinodromus velutinus (Sharp, 1887), comb. nov., is transferred from Carpelimus Leach, 1819. The transferred species is illustrated with SEM images, the others by colour photographs of external morphology. Male and female genitalia plus terminalia of the Neotropical species are illustrated. with line drawings; male characters of the Old World taxa facilitating species recognition are figured.