Spicebush Swallowtail ....sorry about the missing wingtip...I believe it was a lovers spat.
Family name: Papilionidae/Swallowtails
General description: Black with pale blue-green marginal spots. Hindwing with single tail and a large orange spot along costal margin. Hindwing with prominent greenish flush (males) or reduced diffuse blue scaling (females). Ventral hindwing with two rows of orange spots enclosing diffuse blue scaling. Median orange band incomplete and invaded by blue scaling. Abdomen with longitudinal rows of small light spots.
Field Marks: Single hindwing tail; hindwing with large pale blue-green marginal spots; hindwing with single orange spot along costal margin; ventral hindwing with incomplete median orange spot band (invaded by blue) Info courtesy of www.flmnh.ufl.