Flaccilla aecas, the aecas ruby-eye, is a species of skipper butterfly in the family Hesperiidae. It is the only species in the monotypic genus Flaccilla. It is found from Mexico to southern Brazil. References Hesperiidae genera Hesperiinae Butterflies of Central America Hesperiidae of South America Butterflies of North America Taxa named by Caspar Stoll Butterflies described in 1781 Monotypic butterfly genera