| Eastern Tiger Swallowtail | Two-tailed Swallowtail |
| Papilio glaucus | Papilio multicaudatus |
| Host Plant: many, esp. Ashes, Fraxinus | Wafer Ash - Ptelea trifoliata |
| Widespread | Mainly Hill country canyons |
| One tail | Two tails |
| Wider black bands in cell | Thinner black bands in cell |
| Underside: outer margin separated yellow spots | Underside: wide continuous yellow band |
| Black and yellow females | Only yellow females |
| All males are yellow | All males are yellow |
| Below hindwing: smaller yellow marginal spots, sometimes with red | BHW: Large yellow spots shaped like rectangles. form female |
