The members of endemic Australian ladybird genera Erithionyx and Wioletta are revised. Lectotypes are designated for Rhizobius elongatulus Crotch, R.subfusca Blackburn, R.lanosus Blackburn and Erithionyx albatus Lea. R.subfusca Blackburn is found to be a synonym of R.elongatulus Crotch (syn. n.). Wioletta ovata sp. n. is described from Northern Australia. The nomenclatural history, diagnoses and distribution data are provided for each species. Keys to the species of both genera are included.