Notes on some palaearctic and oriental Systropha,with descriptions of new species and a key to the species (Hymenoptera: Apoidea: Halictidae)

An annotated list of the palaearctic and oriental species of the genus Systropha Illiger, 1806, includes additional records for some less well-known species. A lectotype is designated for Systropha hirsuta Spinola, 1839. Systropha christae Warncke, 1992, is synonymized with S. hirsuta. Systropha androsthenes and S. diacantha, spp. n., are described from the Gulf States. A key for the separation of the males is given.