Papilio oxynius

Papilio oxynius, the Cuban black swallowtail, is a species of Neotropical swallowtail butterfly from the genus Papilio that is found in Cuba.

Description
Similar to P. pelaus but the band of the forewing only indicated; the marginal spots of both wings large.

Biology
Larvae feed on Xanthoxylum. Adults are gregarious by day, resting on the trunk and branches.