| Paravilla spaldingi (Painter, R. H., 1933) |
| Paravilla splendida Hall, 1981 |
| Paravilla syrtis (Coquillett, 1887) |
| Paravilla winburni Hall, 1981 |
| Phthiria Meigen, 1803 |
| Phthiria consors Osten-Sacken, 1887 |
| Phthiria dolorosa Williston, 1901 |
| Phthiria sororia Williston, 1901 |
| Phthiriinae Becker, 1913 |
| Phthiriini Becker, 1913 |
| Pioperna Enderlein, 1926 |
| Ploas Latreille, 1804 |
| Podolepida Hull, 1973 |
| Poecilanthrax Osten-Sacken, 1886 |
| Poecilanthrax alcyon (Say, 1824) |
| Poecilanthrax arethusa (Osten-Sacken, 1886) |
| Poecilanthrax butleri Johnson, D. E. & Johnson, L. M., 1957 |
| Poecilanthrax californicus (Cole, 1917) |
| Poecilanthrax effrenus (Coquillett, 1887) |
| Poecilanthrax flaviceps (Loew, 1869) |