Discovery of Steninae from Ningxia, Northwest China (Coleoptera, Staphylinidae)

A study on the Steninae of Ningxia Autonomous Region is presented. Sixteen species are recognized, including new province records for 11 species and four new species: Stenus biwenxuani sp. n., S. liupanshanus sp. n., Dianous yinziweii sp. n., D. ningxiaensis sp. n. Habitus photos of the new species, illustrations of diagnostic characters of all species and a key to species of the Steninae recorded from Ningxia are provided.