Abstract
In the present paper, the genus Spazigasteroides gen. nov. (Diptera, Syrphidae), with Spazigasteroides caeruleus sp. nov. as type species, is described from China. The new genus bears the following characters: Head strongly concave posteriorly and closely appressed to thorax so that the bare postpronota are entirely hidden. Face black in ground colour. Antennae short, with basoflagellomeres slightly longer than wide. Scutellum black. Postmetacoxal bridge incomplete. Legs simple, slender. Wing vein R4+5 straight, vein r-m at basal third of cell dm. Abdomen petiolate, longer than head and thorax together. Male aedeagus two segmented. Based on the subdivision of Syrphinae by Vockeroth (1992), the new genus belongs to the tribe Syrphini, it is separated from the genera of the tribe Syrphini by both the face and scutellum black. In appearance the new genus is also similar to the genus Spazigaster Rondani, the tribe Bacchini, but it is differentiated from the genera of the tribe Bacchini by the two segmented aedeagus.