In his catalogue of the Anophelini (1924) Christophers admitted only one genus the tribe, which he divided into five subgenera: Anopheles (s. str.), Nyssorhynchus, Myzomyia, Bironella and Chagasia. The position of the first three as subgenera Anopheles is now universally accepted, but the arguments in favour of recognising the other two as distinct genera are worth consideration.