The East Asian Trichius bifasciatus group is diagnosed and discussed. An illustrated key to the seven known species is given. T. versutus spec. nov. from North Vietnam is described. Further observations concern: T. elegans var. taiheisanus Kano stat. nov.; T. bowringi Thomson (= T. mandarinus Redtenbacher syn. nov.); T. cupreipes Bourgoin (= T. uraiensis Kano syn. nov., Gnorimus formosanus Niijima & Kinoshita syn. nov.); T. fraterculus fraterculus Moser stat. nov., T. ƒ. duporti Bourgoin stat. nov.; T. lagopus Fairmaire (= T. ferriei Pouillaude syn. nov.). For two names lectotypes are designated.