| Tachygonetria macrolaimus subsp. tetrapapillata (Caballero, 1944) Petter & Douglass, 1976 |
| Tachygonetria neartica (Petter & Douglass, 1976) Adamson & Nasher, 1984 |
| Tachygonetria tetrapapillata Caballero, 1944 |
| Thaparia Ortlepp, 1933 |
| Thaparia macrocephalus Petter & Douglass, 1976 |
| Thaparia microcephalus Petter & Douglass, 1976 |
| Thelandros Wedl, 1862 |
| Thelandros californiensis Read & Amrein, 1952 |
| Thelandros salamandrae Schad, 1960 |
| Thelastomoides Walton, 1927 |
| Thelastomoides longicolle Walton, 1927 |