| Smicronyx californicus Dietz, 1894 |
| Smicronyx cinereus (Motschulsky, 1845) |
| Smicronyx columbianus Dietz, 1894 |
| Smicronyx connivens Casey, 1892 |
| Smicronyx constrictus (Say, 1824) |
| Smicronyx corniculatus (Fåhraeus, 1843) |
| Smicronyx cuscutiflorae Pierce, 1939 |
| Smicronyx defricans Casey, 1892 |
| Smicronyx fallaciosus Klima, 1934 |
| Smicronyx fallax Dietz, 1894 |
| Smicronyx fulvus LeConte, 1876 |
| Smicronyx imbricatus Casey, 1892 |
| Smicronyx instabilis Casey, 1892 |
| Smicronyx lanuginostis Dietz, 1894 |
| Smicronyx loricatus Champion, 1902 |
| Smicronyx obtectus LeConte, 1876 |
| Smicronyx pusillus Dietz, 1894 |
| Smicronyx pusio LeConte, 1876 |
| Smicronyx quadrifer Casey, 1892 |
| Smicronyx resplendens Dietz, 1894 |