Entomophaga Lioy and Proceromyia Mesnil are reviewed. Their phylogenetic relationships are analyzed using adult morphology. Based on the resultant cladograms, Entomophaga is represented as a paraphyletic group and two monophyletic species groups are established: the exoleta group and the nigrohalterata group. The former group includes two species, E. exoleta and E. vernalis sp. nov., and the latter includes three species, E. nigrohalterata, E. sufferta, and E. ussuriensis sp. nov. Monophyly of Proceromyia is confirmed. The new species are described, the male and female postabdomina are illustrated, and a key to the known species of Entomophaga and Proceromyia is provided.