This species ranges from southern British Columbia southeast to northern Arizona and northwestern Colorado, extending east as far as central Montana and western Nebraska. It occurs in sections of Idaho scattered throughout the state.
It occurs most frequently in fields, dry streambeds, valleys, and canyons.
Caterpillars feed on the leaves of certain thistles in the genus Cirsium.
Adult: Butterflies drink flower nectar from yellow flowers belonging to the sunflower family (Asteraceae).
There is one generation of caterpillars each summer. Young caterpillars feed in groups. The overwintering stage is unreported. Adults generally fly from the end of April to July, and from August through October.
Males perch and rarely patrol for receptive females. Females lay groups of eggs on the undersides of host plant leaves.
|Idaho Status:||Unprotected nongame species.|
G5; populations are widespread, abundant, and secure.
Opler, P. A., H. Pavulaan, and R. E. Stanford. 1995. Butterflies of North America. Jamestown, North Dakota, USA: Northern Prairie Wildlife Research Center Home Page. http://www.npwrc.usgs.gov/resource/distr/lepid/bflyusa/bflyusa.htm (Version 05Nov98).
Opler, P. A. and A. B.Wright. 1999. A Field Guide to the Western Butterflies. Second Edition. Peterson Field Guide Series. Houghton Mifflin Company, New York, New York, USA, 540 pp.
Pyle, R. M. 1981. National Audubon Society Field Guide to North American Butterflies. Alfred A. Knopf, Inc., New York, New York, USA, 924 pp.
Scott, J. A. 1986. The Butterflies of North America. Stanford University Press, Stanford, California, USA, 583 pp.
Stanford, R. E. and P. A. Opler. 1993. Atlas of Western U.S.A. Butterflies (Including Adjacent Parts of Canada and Mexico). Published by authors, Denver, Colorado, USA, 275 pp.