![]() This releases a bad smell that is used as defense mechanism. They have a forked gland called the osmeterium that can protrude from the back of the head if the butterfly is alarmed. Summer forms are larger, have broader black stripes, and longer, black tails with white edges.Ĭaterpillars are generally hairless. Spring forms are smaller, more white, and have short, black tails with white tips. marcellus has two seasonal forms, one occurring in the spring and the other in the summer. A red stripe runs along the middle of the ventral hind wing. ![]() The inner margin of the hind wing has two blue spots on the corner and a red spot near the body. A pair of swordlike tails extend from the hind wings. The triangular wings are white to greenish-white with black longitudinal stripes. ![]() The Zebra Swallowtail has a wingspan of 6.4 to 10.4 cm (2.5 to 4.1 in). The butterflies are closely associated with pawpaws, and are rarely found far from these trees. Its distinctive wing shape and long tails make it easy to identify, and its black and white-striped pattern is reminiscent of a zebra. Underside of hindwing with wide pale submarginal band and large silver spots.The Zebra Swallowtail ( Protographium marcellus, formerly listed under genera Eurytides, Iphiclides, Graphium and Papilio by some authorities) is a swallowtail butterfly native to the eastern United States and southeast Canada. Upperside of male tan to orange with black scales on forewing veins female tawny, darker than male. Spring and fall short-day form is smaller, less yellow, with reduced black areas. Underside of hindwing and forewing apex evenly yellow-green or gray-green. Two submarginal black spots in female, one in male. Upperside of wings white forewing with black tip. In the Southwest, yellow forms predominate in the subspecies P. Female hindwing with iridescent blue band. Male has yellow band near edge of wings female has row of yellow spots. Upper surface of wings mostly black on inner edge of hindwing is a black spot centered in larger orange spot. Underside of hindwing pale gray with black bar at end of cell, distinct black spots, and three large orange spots at outer margin near tail. Upperside of male iridescent blue summer females uniformly brown, spring females smaller with much blue at the wing bases. The winter form is smaller and duller, summer form larger and brighter with an interrupted forewing band. Upperside is black with white spots near the apex forewing with red median band, hindwing with red marginal band. Spring and fall forms are smaller and less conspicuously marked. Female has 2 forms: yellow form with uneven black edging enclosing yellow spots, and a white form which is greenish-white rather than yellow. Upper surface of male wings bright, clear yellow with solid black edging lower side of forewing with some dark submarginal spots hindwing with silver cell spot rimmed with orange-pink, usually doubled. Underside hindwing spot silver with 2 concentric dark rings, and a spot above it. Female yellow or white with irregular black border surrounding light spots. Upperside of male yellow with orange overlay, yellow veins, wide black border, and dark black cell spot. On the underside of forewing of spring individuals the row of marginal spots may be merged into a continuous band, thus appearing similar to the Canadian Tiger Swallowtail. The upperside hindwing has a prominent orange marginal spot that is generally larger than the row of pale marginal spots. Hindwing of both female forms has a row of striking blue chevrons and an iridescent blue wash over parts of the interior hindwing. Female has 2 forms: one yellow like the male and the other black with shadows of dark stripes. Spring and fall broods (form marcia) have a gray mottled hindwing below. Underside of hindwing has a dark marginal patch containing a light-colored crescent. Upperside is orange with black borders postmedian and submarginal areas are crossed by fine black marks. The Viceroy butterfly (Limenitis archippus) is a Mullerian mimic it has similar coloration and is also distasteful. Both sexes have white spots on borders and apex. Upperside of female is orange-brown with wide black borders and blurred black veins. Upperside of male is bright orange with wide black borders and black veins hindwing has a patch of scent scales.
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