| Liohippelates robertsoni (Sabrosky, 1941) |
| Malloewia Sabrosky, 1980 |
| Malloewia neglecta (Becker, 1912) |
| Merectecephala Duda, 1930 |
| Meromyza Meigen, 1830 |
| Meromyza americana Fitch, 1856 |
| Meromyza communis Fedoseeva, 1971 |
| Meromyza opacula Fedoseeva, 1978 |
| Meromyza pilosa Fedoseeva, 1971 |
| Microchaetaspis Duda, 1930 |
| Mimogaurax Hall, D. G., 1937 |
| Monochaetoscinella Duda, 1930 |
| Monochaetoscinella anonyma (Williston, 1896) |
| Monochaetoscinella attingens (Duda, 1930) |
| Monochaetoscinella pura (Curran, 1926) |
| Neodiplotoxa Malloch, 1914 |
| Neodiplotoxa mexicana (Duda, 1930) |
| Neodiplotoxa pulchripes (Loew, 1872) |
| Olcella Enderlein, 1911 |
| Olcella cinerea (Loew, 1863) |