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Butterflies of Montana -- Papilio polyxenes

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Butterflies of Montana

Black Swallowtail (Papilio polyxenes)
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Black Swallowtail (Papilio polyxenes Fabricius)

Wing span: 3 1/4 - 4 1/4 inches (8 - 11 cm).

Identification: Upper surface of wings mostly black; on inner edge of hindwing is a black spot centered in larger orange spot. Male has yellow band near edge of wings; female has row of yellow spots. Female hindwing with iridescent blue band. In the Southwest, yellow forms predominate in the subspecies P. coloro.

Life history: Males perch and patrol for receptive females. Female lays eggs singly on leaves and flowers of the host, which are then eaten by hatching larvae. Hibernates as a chrysalis.

Flight: One-2 flights from April-October in northern regions of range; 3 flights in southern regions.

Caterpillar hosts: Leaves of plants in the parsley family (Apiaceae) including Queen Anne's Lace, carrot, celery and dill. Sometimes plants in the citrus family (Rutaceae) are preferred.

Adult food: Nectar from flowers including red clover, milkweed, and thistles.

Habitat: A variety of open areas including fields, suburbs, marshes, deserts, and roadsides.

Range: Most of the eastern U.S., north into Quebec, west into s. Saskatchewan, Colorado and se. California; south to n. South America. Subspecies coloro in desert Southwest.

Conservation: Not usually of concern.

Management needs: Maintain open fields in East.

The Nature Conservancy Global Rank: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

References:

Opler, P. A. and G. O. Krizek. 1984. Butterflies east of the Great Plains.
     Johns Hopkins University Press, Baltimore. 294 pages, 54 color plates.

Opler, P. A. and V. Malikul. 1992. A field guide to eastern butterflies.
     Peterson field guide #4. Houghton-Mifflin Co., Boston. 396 pages, 48
     color plates.

Scott, J. A. 1986. The butterflies of North America. Stanford University Press,
     Stanford, Calif. 583 pages, 64 color plates.

Author: Jane M. Struttmann

State and Regional References:

Elrod, M.J. 1906. The Butterflies of Montana. Bulletin of the University of
     Montana 30: 1-174.

Ferris, C.D. and F.M. Brown. 1980. Butterflies of the Rocky Mountain States. 
     University of Oklahoma Press. Norman.

Layberry, R.A., Hall, P.W. & Lafontaine, D.J., 1998.  The Butterflies of 
     Canada.  University of Toronto Press, Toronto, ON.  280 pp. 

Opler, Paul A. 1999. Peterson Field Guide to Western Butterflies, revised 
     edition. Houghton Mifflin Co., Boston, Mass.

Stanford, R.E. and P.A. Opler. 1993. Atlas of Western USA Butterflies. 
     Privately published, Denver, Colo.

Tilden, J.W. and A.C. Smith. 1986. A Field Guide to Western Butterflies. 
     Houghton Mifflin Co., Boston, Mass.
Black Swallowtail (Papilio polyxenes)
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