The genus Aetius O.Pickard-Cambridge, 1897 has been discovered in Sri lanka, India, Malaysia (Borneo), Thailand and Ivory Coast and comprises four species: A.bicuspidatus Yamasaki, 2020, A.decollatus Twine O.Pickard-Cambridge, 1897, A.
nocturnus Deeleman-Reinhold, 2001 and A.tuberculatus (Haddad, 2013).The genus Aetius O.Pickard-Cambridge, 1897 is reported for the first time in China (Yunnan Province) and includes three species: one new species and two newly-recorded species.One new species is described, based on both sexes: A.
maculatus toy-cleaner sp.n.Additionally, A.bicuspidatus Yamasaki, 2020 and A.nocturnus Deeleman-Reinhold, 2001, are newly recorded from China, with photographs of habitus and genitalia being provided.