| Onthophagus rhinophyllus Harold, 1869 |
| Onthophagus rostratus Harold, 1869 |
| Onthophagus rufescens Bates, 1887 |
| Onthophagus sancristobalensis Moctezuma & Halffter, 2020 |
| Onthophagus sanpabloetlorum Moctezuma & Halffter, 2020 |
| Onthophagus santamariensis Moctezuma, Sánchez-Huerta & Halffter, 2020 |
| Onthophagus schaefferi Howden & Cartwright, 1963 |
| Onthophagus semiopacus Harold, 1869 |
| Onthophagus sharpi Harold, 1875 |
| Onthophagus skelleyi Sánchez-Huerta, Zunino & Halffter, 2018 |
| Onthophagus subcancer Howden, 1973 |
| Onthophagus subopacus Robinson, 1940 |
| Onthophagus tarascus Zunino & Halffter, 1988 |
| Onthophagus tarascus subsp. jaliscensis Zunino & Halffter, 1988 |
| Onthophagus tarascus subsp. tarascus Zunino & Halffter, 1988 |
| Onthophagus totonacus Moctezuma & Halffter, 2021 |
| Onthophagus totonicapamus Bates, 1887 |
| Onthophagus undulans Bates, 1889 |
| Onthophagus undulans subsp. oaxacanus Zunino & Halffter, 1988 |
| Onthophagus undulans subsp. undulans Bates, 1889 |