Imms (A textbook of Entomology 1960 Edited by Richards and Davis) has this to say: (Of the family Milichiidae) Meoneura (found on carrion or in birds' nests) and Carna are sometimes placed in a family Carnidae. Carnus hemapterus is exclusively found in birds' nests and the wings break off by the time the adults are mature. The flies feed on the blood of the hosts but the larval habits are not known.
