Euchloe lotta
Desert Marble

Family Description:
Alternate Common Names:Pearly Marble White, Pearly Marblewing, Western Marble, Hyantis Marble.
Note: Some authors consider this species to be a subspecies of Euchloe hyantis, the Pearly Marble. As presented here, Euchloe lotta occurs throughout Idaho and Euchloe hyantis is a more strictly defined species occurring primarily in northern and central California.
The caterpillar is green to grayish green and marked lengthwise along the sides with white edged with purple along the top.
Adult: The butterfly is small to medium-sized, with a wingspan of 1 to 1   inches. It is pearly white on the upperside, with the interior of the wings shaded black close to the body. The forewing is spotted with black at the tip, and has a solid black bar just in from the edge. The hindwing is white, and the underside markings partially show through. Underneath, the forewing is white and marked similarly to the top, but more greenish in color. The underside of the hindwing is marbled with thick green to brown lines.

A western butterfly, it ranges from southern British Columbia south through eastern Washington and Oregon to southeastern California, and east to western Montana south to western New Mexico. It occurs throughout most of the state of Idaho.


It is found in dry, open areas, including sagebrush steppe, chaparral, deserts, open woodlands, and rocky canyons.


Caterpillar: Caterpillars typically eat the flowers and fruits of members of the mustard family (Brassicaceae), such as rock cress (Arabia spp.), tansy mustard (Descurainia spp.), and jewel flower (Streptanthus spp.).
Adult: Butterflies drink flower nectar.


There is one generation of caterpillars each growing season. Pupae overwinter in a physiological state called diapause. Adults generally fly from February to June.

Males actively patrol for receptive females. Females lay yellow, elongated eggs singly typically on the leaves of host plants.

Idaho Status: Unprotected nongame species.
Global Rank:


Ferris, C. D. and F. M. Brown. (eds.) 1981. Butterflies of the Rocky Mountain States. Univ. of Oklahoma Press, Norman, Oklahoma, USA, 442 pp.

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. (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.