A new genus, Mirocaudagen. nov., and a new species, Mirocauda albilineanasp. nov., are described and illustrated. Because of the nature of the post-tibial spur, this genus belongs to the tribe Tropidocephalini. A key to the 17 Chinese genera (including 3 subgenera) of the tribe Tropidocephalini is provided. Two new synonymies are reported: Malaxa aurunca Yang et Yang, 1986 is a junior synonym of Malaxella flava Ding et Hu, 1986 and Specinervures liquida Yang et Yang, 1986 is a junior synonym of Specinervures interrupta Ding et Hu, 1986. A checklist of genera in the tribe Tropidocephalini from the People's Republic of China is appended.