Hemiargus ceraunus, the Ceraunus Blue, is a butterfly in the Lycaenidae family. It is found in the south-western United States, southern Texas, Florida and the Florida Keys south through the West Indies, Mexico and Central America to South America. Strays may be found in North Carolina, Missouri, Kansas and Nevada. The habitat consists of open woodland, desert scrub, dunes, pastures, road edges and vacant lots. The larvae feed on the flowers and seedpods of various woody legumes, including Cassia brachiata, Abrus precatorius and Prosopis species.
