| Trichoton (Trichoton) sordidum (LeConte, 1851) |
| Trientoma Solier, 1835 |
| Trientoma mexicana Champion, 1884 |
| Trientoma rugifrons Champion, 1884 |
| Trientoma sallei Kraatz, 1865 |
| Trimytis LeConte, 1851 |
| Trimytis abnormis Horn, 1870 |
| Trimytis ceralboensis Blaisdell, 1943 |
| Trimytis flohri Champion, 1892 |
| Trimytis obovata Champion, 1892 |
| Trimytis obtusa Horn, 1894 |
| Trimytis subsenilis Blaisdell, 1923 |
| Triorophus LeConte, 1851 |
| Triorophus laevis LeConte, 1851 |
| Triorophus laevis subsp. laevis LeConte, 1851 |
| Triorophus lecontei Casey, 1890 |
| Triorophus nodiceps LeConte, 1853 |
| Triphalopsis Blaisdell, 1923 |
| Triphalopsis californica Doyen, 1983 |
| Triphalopsis impressicollis Blaisdell, 1943 |