Composia fidelissima sometimes known as the faithful beauty or Uncle Sam moth is a moth in the Erebidae family. It is found in southern Florida and the West Indies, including Cuba. The wingspan is 48–64 mm. Adults are on wing year round. They are day-flying. The larvae feed on Cynanchum scoparium, Canavalia (including Canavalia rosea), Nerium (including Nerium oleander) and Echites species (including Echites umbellate).