| Rhombothyria flavicosta Wulp, 1891 |
| Salmacia Meigen, 1800 |
| Sarcolydella Townsend, 1927 |
| Saundersia Schiner, 1868 |
| Saundersipmima Townsend, 1927 |
| Schizocerophaga Townsend, 1916 |
| Scopolia Robineau-Desvoidy, 1830 |
| Scotiptera Macquart, 1835 |
| Scotiptera cyanea Giglio-Tos, 1893 |
| Scotiptera varipennis Wulp, 1891 |
| Sipholeskia Townsend, 1916 |
| Siphona Meigen, 1803 |
| Siphona (Aphantorhapha) Townsend, 1919 |
| Siphona (Aphantorhapha) pulla (Reinhard, 1975) |
| Siphona (Baeomyia) O'Hara, 1984 |
| Siphona (Baeomyia) antennata (O'Hara, 1984) |
| Siphona (Baeomyia) sonorensis (O'Hara, 1984) |
| Siphona (Siphona) Meigen, 1803 |
| Siphona (Siphona) akidnomyia O'Hara, 1982 |
| Siphona (Siphona) brunnea O'Hara, 1982 |