Abstract
The species of the genus Cacodaemon of Vietnam are revised. A new species, Cacodaemonvietnamensis sp. nov., is described and C.laotinuslaotinus (Arrow, 1920) is newly recorded from Vietnam. A previously known species, C.proavus Strohecker, 1964 is redescribed based on an additional female specimen and a key to species of the genus Cacodaemon in Vietnam is provided.