| Oncorhinus scabricollis Gyllenhal, 1836 |
| Onychobaris LeConte, 1876 |
| Onychobaris ambigua Casey, 1892 |
| Onychobaris chihuahuae Casey, 1920 |
| Onychobaris nicaraguensis Solari & Solari, 1906 |
| Onychobaris punctatissima Solari & Solari, 1906 |
| Onychobaris senecta Champion, 1909 |
| Onycholipini Wollaston, 1873 |
| Oopterinus Casey, 1892 |
| Oopterinus aeneopiceus Champion, 1903 |
| Oopterinus bactrianus Champion, 1903 |
| Oopterinus castaneipennis Champion, 1903 |
| Oopterinus championi Sleeper, 1954 |
| Oopterinus glabratus Champion, 1903 |
| Oopterinus laevigatus Champion, 1903 |
| Oopterinus piliferus Champion, 1903 |
| Ophryastes Germar, 1829 |
| Ophryastes argentatus LeConte, 1853 |
| Ophryastes aridus (Fall, 1910) |
| Ophryastes cinereus Fåhraeus, 1840 |