| Ditrichophora Cresson, 1924 |
| Ditrichophora chiapas Mathis, 1997 |
| Dryxini Zatwarnicki, 1992 |
| Ephydra Fallén, 1810 |
| Ephydra (Ephydra) Fallén, 1810 |
| Ephydra (Ephydra) mexicana Cresson, 1934 |
| Ephydra (Ephydra) millbrae Jones, 1906 |
| Ephydra (Ephydra) packardi Wirth, 1971 |
| Ephydra (Halephydra) Wirth, 1971 |
| Ephydra (Halephydra) cinerea Jones, 1906 |
| Ephydra (Halephydra) gracilis Packard, 1871 |
| Ephydra (Hydropyrus) Cresson, 1934 |
| Ephydra (Hydropyrus) hians Say, 1830 |
| Ephydra californica Packard, 1871 |
| Ephydra crassimana Loew, 1866 |
| Ephydra tarsata Williston, 1893 |
| Ephydridae Zetterstedt, 1837 |
| Ephydrinae Zetterstedt, 1837 |
| Ephydrini Zetterstedt, 1837 |
| Gastrops Williston, 1897 |