Archonias brassolis, the cattleheart white, is a butterfly in the family Pieridae and only member of the Archonias genus. It is found from Central America, south through most of South America. The wingspan is 56–65 mm for A. b. rubrosparsa and 31–34 mm for A. b. approximata. The larvae feed on Loranthaceae species and are gregarious. Adults of A. b. approximata have been recorded feeding on the nectar of Eupatorium species.