| Megasattus erosus subsp. manuelis Blaisdell, 1923 |
| Megasattus laeviventris Blaisdell, 1923 |
| Megasattus sternalis Blaisdell, 1923 |
| Megasida Casey, 1912 |
| Megasida latissima (Champion, 1892) |
| Megasida magnifica Pallister, 1954 |
| Megasida moricoides (Champion, 1892) |
| Megasida obliterata (Champion, 1892) |
| Megasida zacatecensis Pallister, 1954 |
| Melanastus Casey, 1907 |
| Melanastus obesus (LeConte, 1851) |
| Melanastus obscurus Blaisdell, 1923 |
| Melanastus sonoricus Casey, 1907 |
| Melasia Perroud & Mulsant, 1856 |
| Melasia tarsalis Perroud & Mulsant, 1856 |
| Menes Champion, 1888 |
| Menes meridanus Champion, 1888 |
| Menes rotundatus Champion, 1888 |
| Menoeceus Champion, 1888 |
| Menoeceus aequalis Champion, 1888 |