| Megasoma vogti Cartwright, 1963 |
| Megathoposoma Balthasar, 1939 |
| Megathoposoma candezei Harold, 1873 |
| Melolonthina Leach, 1819 |
| Melolonthinae Leach, 1819 |
| Melolonthini Leach, 1819 |
| Mendidius Harold, 1868 |
| Mendidius spiniclypeus (Hinton, 1934) |
| Mesosternus Morón, 1987 |
| Mesosternus halffteri Morón, 1987 |
| Mimeoma Casey, 1915 |
| Mimeoma acuta Arrow, 1902 |
| Nanotermitodius Howden, 2003 |
| Nanotermitodius peckorum Howden, 2003 |
| Nayarita Morón & Nogueira, 1998 |
| Nayarita viridinota Morón & Nogueira, 1998 |
| Nefoncerus Saylor, 1938 |
| Nefoncerus convergens Horn, 1894 |
| Neopsammodius Rakovic, 1986 |
| Neopsammodius blandus Fall, 1932 |