Lethrus (Lethrus) schneideri Kral & Hillert, sp. n. from Thrace, Greece, is described. The new species is morphologically most similar and probably closely related to L. (L.) apterus (Laxmann, 1770) and L. (L.) ares Kral, Rejsek & Schneider, 2001.
Diagnostic characters (shape of mandibles, ventral mandible processes, pronotum and parameres) are illustrated. Character matrix for separation of males of the Lethrus species closely related to L. schneideri Kral & Hillert, sp. n. and geographic ranges for all species studied are mapped.