| The cells below, the submarginal initials, provide the tissue of the inner part of the leaf. |
| It is best distinguished from the Canadian Tiger Swallowtail by the entirely yellow lunular submarginal spots on the underside of the hindwing. |
| The wings with one marginal and three submarginal cells, and one recurrent nervure. |
| The female has orange forewings with prominent black spots and an orange submarginal zigzag band on the hindwing upperside. |
| The two black spots on the forewing leading edge are much more intensely black than the marginal and submarginal grey bands. |
| Marginal and submarginal meristems on opposite flanks of the primordium initiate leaf-blade formation. |
