| Spilochalcis tanais Burks, 1940 |
| Spilochalcis tenebrosa (Walker, 1862) |
| Spilochalcis transitiva (Walker, 1862) |
| Spilochalcis trinidadensis (Ashmead, 1904) |
| Spilochalcis tucumana (Blanchard, 1942) |
| Spilochalcis virens Howard, 1885 |
| Stomatoceras Kirby, 1883 |
| Stomatoceras rubra Ashmead, 1894 |
| Stomatoceras rubra var. eriensis Wallace, 1942 |
| Stomatoceras rufipes (Cameron, 1907) |
| Stypiura Kirby, 1883 |
| Stypiura dentipes (Fabricius, 1804) |
| Stypiura rufiventris (Sichel, 1866) |
| Temnata Cameron, 1897 |
| Tetrasmicra Ashmead, 1904 |
| Tetrasmicra longispina (Cameron, 1913) |
| Thaumapus Kirby, 1883 |
| Thaumatelia Kirby, 1883 |
| Thaumateliana Girault, 1912 |
| Thaumatopus Schulz, 1906 |