Elements for a revision of the genus Amauronyx Reitter, 1882, with description of seventeen new species (Coleoptera, Staphylinidae, Pselaphinae). The most important morphological structures for the discrimination of species belonging to the genus Amauronyx Reitter, 1882, are studied in detail; differences with the genus Trichonyx Chaudoir, 1845, are specified. The phenomenon of antisymmetry of the terminalia and genitalia, observed in five species, is commented. Holotypes of two previously described species are examined and lectotypes are designated for ten species, whose essential characters are indicated, with unpublished chorological data. Seventeen new species are described : A. aubei n. sp., A. besucheti n. sp., A. hlavaci n. sp., A. meybohmi n. sp. and A. serranoi n. sp., from Portugal, A. tronqueti n. sp., from Spain, A. normandi n. sp., A. peyerimhoffi n. sp. and A. theryi n. sp., from Algeria, A. vaucheri n. sp., from Morocco, A. kociani n. sp., from Armenia, A. saulcyi n. sp., from Cyprus, A. karamani n. sp., A. machulkai n. sp. and A. reitteri n. sp., from Greece, A. binaghii n. sp. and A. viti n. sp., from Turkey. The genus is new for Corsica, Armenia, Cyprus and Turkey; its presence in Iran is confirmed.