| Megathymini Comstock & Comstock, 1895 |
| Megathymus Scudder, 1872 |
| Megathymus beulahae D. Stallings & Turner, 1958 |
| Megathymus beulahae subsp. beulahae D. Stallings & Turner, 1958 |
| Megathymus beulahae subsp. gayleae D. Stallings, Turner & V. Stallings, 1963 |
| Megathymus drucei Skinner, 1911 |
| Megathymus ursus Poling, 1902 |
| Megathymus ursus subsp. ursus Poling, 1902 |
| Megathymus ursus subsp. violae Stallings & Turner, 1956 |
| Megathymus yuccae (Boisduval & LeConte, 1834) |
| Megathymus yuccae subsp. arizonae Tinkham, 1954 |
| Megathymus yuccae subsp. louiseae Freeman, 1963 |
| Megathymus yuccae subsp. martini D. Stallings & Turner, 1956 |
| Megathymus yuccae subsp. reubeni Stallings, Turner & V. Stallings, 1963 |
| Megathymus yuccae subsp. wilsonorum Stallings & Turner, 1958 |
| Megistias Godman, 1900 |
| Megistias argus Draudt, 1924 |
| Megistias ignarus Bell, 1932 |
| Megistias isus Godman, 1900 |
| Megistias labdacus Godman, 1900 |