| Cycnoderus (Cycnoderus) brevicolle Giesbert & Chemsak, 1993 |
| Cycnoderus (Cycnoderus) copei Giesbert & Chemsak, 1993 |
| Cycnoderus (Cycnoderus) lividus Giesbert & Chemsak, 1993 |
| Cycnoderus (Cycnoderus) virginiae Giesbert & Chemsak, 1993 |
| Cymatonycha Bates, 1874 |
| Cymatonycha castanea Bates, 1874 |
| Cymatonycha fasciata Chemsak & Noguera, 1995 |
| Cyphonotida Casey, 1913 |
| Cyphonotida rostrata (Bates, 1872) |
| Cyphonotida rostrata subsp. borealis Linsley & Chemsak, 1976 |
| Cyphonotida rostrata subsp. rostrata (Bates, 1872) |
| Cyphonotida rostrata subsp. texana Giesbert & Hovore, 1998 |
| Cyphonotida rostrata subsp. ventralis (Horn, 1894) |
| Cyphosterna Chevrolat, 1862 |
| Cyphosterna quadrilineata Chevrolat, 1862 |
| Cyrtinini Thomson, 1864 |
| Cyrtinus LeConte, 1852 |
| Cyrtinus beckeri Howden, 1960 |
| Cyrtinus fisheri Wappes, Santos-Silva & Nascimento, 2020 |
| Cyrtinus howdeni Wappes, Santos-Silva & Nascimento, 2020 |