Cadmus (Brachycaulus) colossus

Cadmus (Brachycaulus) colossus, or Cadmus colossus, is a species of beetle in the subfamily, Cryptocephalinae, or case-bearing leaf beetles, and the subgenus, Brachycaulus. It was first described by Félicien Chapuis in 1875, from a male specimen collected at Port Denison. It is native to Australia, being found in New South Wales and Queensland.

The taxonomic reasoning for the subgeneric arrangement (accepted by the Australian Faunal Directory) is given in Mathews and Reid (2002).