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The Collaborative International Dictionary
Papilio troilus

Troilus butterfly \Tro"i*lus butterfly\ A large American butterfly ( Papilio troilus). It is black, with yellow marginal spots on the front wings, and blue on the rear; -- also called troilus.

Papilio troilus

Troilus \Tro"i*lus\, n.; pl. L. Troili, E. Troiluses. [NL., fr. L. Troilus, Gr. ?, the son of Priam.] (Zo["o]l.) A large, handsome American butterfly ( Euph[oe]ades troilus, or Papilio troilus). It is black, with yellow marginal spots on the front wings, and blue spots on the rear wings; -- also called troilus butterfly.

Wikipedia
Papilio troilus

The Spicebush Swallowtail (Papilio troilus) is a common black swallowtail butterfly found in North America, also known as the Green-Clouded butterfly. It has two subspecies, Papilio troilus troilus and Papilio troilus ilioneus, the latter found mainly in the Florida peninsula. The spicebush swallowtail derives its name from its most common host plant, the spicebush, members of the genus Lindera.

The family to which Spicebush Swallowtails belong, Papilionidae, or swallowtails, include the largest butterflies in the world. The swallowtails are unique in that even while feeding, they continue to flutter their wings. Unlike other swallowtail butterflies, Spicebushes fly low to the ground instead of at great heights.