Cecidomyidae

Cecidomyidae, a family of flies known as the Gall Gnats, and including the Wheat Midge (q.v.) and the Hessian Fly (q.v.). Many species exhibit the phenomenon of alternation of generations, as the larvae at certain seasons are produced from larvae instead of from adults. They belong to the order Diptera, under which a summary of the characters is given.