| Ginglymia dextella (Reinhard, 1953) |
| Ginglymia fracida Reinhard, 1962 |
| Ginglymia johnsoni (Coquillett, 1895) |
| Glaurocarini Townsend, 1926 |
| Gnadochaeta Macquart, 1850 |
| Gnadochaeta madera (Townsend, 1915) |
| Gnadochaeta madrensis Townsend, 1915 |
| Gnadochaeta neomexicana (Townsend, 1915) |
| Gnadochaeta sierricola (Townsend, 1917) |
| Gonia Meigen, 1803 |
| Gonia longipulvilli Tothill, 1924 |
| Gonia mexicana Wulp, 1890 |
| Gonia sequax Williston, 1887 |
| Gonia texensis Reinhard, 1924 |
| Goniinae Lioy, 1864 |
| Goniinae cessatrix Walker, 1861 |
| Goniinae cincta Giglio-Tos, 1893 |
| Goniinae desita Walker, 1861 |
| Goniinae gracilens Giglio-Tos, 1893 |
| Goniinae insita Giglio-Tos, 1893 |