| Tomicobia tibialis Ashmead, 1904 |
| Tomocera Howard, 1881 |
| Tomocerodes Girault, 1916 |
| Tomocerodes americanus Girault, 1916 |
| Toxeumelloides Girault, 1913 |
| Toxeumelloides cavigena Boucek, 1993 |
| Toxeumopsis Girault, 1915 |
| Trimeromicrus Gahan, 1914 |
| Trimeromicrus maculatus Gahan, 1914 |
| Tripolycystus Dodd, 1915 |
| Tripolycystus cryptognathae Girault, 1920 |
| Trydymiformis Girault, 1915 |
| Urielloides Girault, 1913 |
| Uriellomyia Girault, 1915 |
| Urolepis Walker, 1846 |
| Urolepis rufipes (Ashmead, 1896) |
| Vespita Boucek, 1993 |
| Vespita woolleyi Boucek, 1993 |
| Xenocrepis Förster, 1856 |
| Xenocrepis mexicana Girault, 1916 |