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Species Papilio joanae - Ozark Swallowtail - Hodges#4160

Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Papilionoidea (Butterflies and Skippers)
Family Papilionidae (Swallowtails, Parnassians)
Subfamily Papilioninae
Tribe Papilionini (Fluted Swallowtails)
Genus Papilio
Species joanae (Ozark Swallowtail - Hodges#4160)
Hodges Number
Closely similar to Papilio polyxenes and difficult to distinguish from that species. The tegulae of the prothorax (little "hairy" flaps above the base of the front wings) are often almost entirely yellow in this species and rarely so (mostly black) in P. polyxenes. P. joanae more often has the dark pupil of the orange anal spot connected to the black margin on the hind wing (almost always so on the under side, usually on the upper) than does P. polyxenes. P. joanae is more restricted to wooded areas, while P. polyxenes is wide-ranging, and favors open sunny areas (more likely to be seen in the garden).

Also, extremely similar to black form Papilio machaon bairdii, to which it is probably very closely related, but which occurs further west.
primarily in the Ozark region, in Missouri and northern Arkansas; reported also from Kentucky; should be watched for in eastern Oklahoma and in southern Illinois.
Molecular studies imply that P. joanae might be an isolated subspecies of P. machaon.
Internet References
Papilio joanae at Butterflies of America
Papilio polyxenes asterius at Butterflies of America