| Leptogaster aegra Martin, 1957 |
| Leptogaster concinnata Williston, 1901 |
| Leptogaster crocea Williston, 1901 |
| Leptogaster fervens Wiedemann, 1830 |
| Leptogaster intima Williston, 1901 |
| Leptogaster micropygialis Williston, 1901 |
| Leptogaster triangulata Williston, 1901 |
| Leptogaster truquii Bellardi, 1861 |
| Leptogastrinae Schiner, 1862 |
| Leptopteromyia Williston, 1907 |
| Leptopteromyia mexicanae Martin, 1971 |
| Lissoteles Bezzi, 1910 |
| Lissoteles acapulcae Martin, 1961 |
| Lissoteles aquilonius Martin, 1961 |
| Lissoteles autumnalis Martin, 1961 |
| Lissoteles vanduzeei Cole, 1923 |
| Loewiella Williston, 1896 |
| Machimus Loew, 1849 |
| Machimus acutus Martin, 1975 |
| Machimus alterus (Williston, 1901) |