| Thevenetimyia (Thevenetimyia) marginata (Osten-Sacken, 1877) |
| Thevenetimyia (Thevenetimyia) melanosus (Williston, 1893) |
| Thevenetimyia (Thevenetimyia) painterorum (Hall, 1969) |
| Thevenetimyia (Thevenetimyia) quadrata (Williston, 1901) |
| Thevenetimyia (Thevenetimyia) yosemite (Cresson, 1919) |
| Thyridanthrax Osten-Sacken, 1886 |
| Thyridanthrax fenestratoides (Coquillett, 1892) |
| Thyridanthrax macula (Cole, 1919) |
| Thyridanthrax meridionalis (Cole, 1923) |
| Thyridanthrax otiosa (Coquillett, 1887) |
| Thyridanthrax selene (Osten-Sacken, 1886) |
| Thyridanthrax sini (Cole, 1923) |
| Tmemophlebia Evenhuis, 1986 |
| Tmemophlebia aldrichi (Johnson, C. W., 1904) |
| Tmemophlebia amplicella (Coquillett, 1904) |
| Tmemophlebia borealis (Johnson, C. W., 1911) |
| Tmemophlebia coquilletti (Johnson, C. W., 1902) |
| Tmemophlebia cyanoceps (Johnson, C. W., 1904) |
| Tomomyzinae Becker, 1913 |
| Tornotes Gistel, 1848 |