| Ophryastes symmetricus Fall, 1907 |
| Ophryastes tuberosus LeConte, 1853 |
| Ophryastes turbinatus (Champion, 1911) |
| Ophryastes variabilis (Pierce, 1913) |
| Ophryastes varius LeConte, 1853 |
| Ophryastes vittatus (Say, 1824) |
| Ophryastini Lacordaire, 1863 |
| Optatini Champion, 1907 |
| Optatus Pascoe, 1889 |
| Optatus fasciculosus Champion, 1907 |
| Optatus palmaris (Pascoe, 1889) |
| Orchestomerus Dietz, 1896 |
| Orchestomerus bicarinatus (Champion, 1907) |
| Orchestomerus chiriquensis (Champion, 1907) |
| Orchestomerus gibbicollis Champion, 1907 |
| Orchestomerus phytobioides (Champion, 1907) |
| Orimodema Horn, 1876 |
| Orimodema protracta Horn, 1876 |
| Orthomerinus Champion, 1908 |
| Orthomerinus pittieri Champion, 1908 |