I have suggested in “Papilio” that this South American species belongs to Copidryas, and is congeneric with our C. Gloveri. Berg's original description says of the frontal structure:- “Fronte valde prominenti, supra cornu complanato depressione declivi marginata fuscaornata.” This character agrees well with Copidryas, but not with Eudryas, in which latter the front is not horned.