The following new synonymy is established: Hygia opaca (Uhler, 1860) = H. japonica Ahmad, 1969, syn. n., H. lativentris (Motschulsky, 1866) = H. touchei (Distant, 1901), syn. n. Hygia opaca opaca sensu Ahmad, 1969 is a misidentification of H. lativentris (Motschulsky, 1866), the latter species does not belong to the subgenus Microcolpura. The records of H. obscura (Dallas, 1852) from Korea and China are considered mistakes
