Callophrys sheridanii
Sheridan’s Hairstreak

Family Description:
Alternate Common Names:White-lined Green Hairstreak, Little Green Hairstreak.
Note: The green hairstreaks of the genus Callophrys can be difficult to identify. There is still some debate among scientists about the exact boundaries between some species.

Caterpillar: Caterpillars are variable in color, but generally are green to pink, and marked lengthwise with white to light yellow stripes. Often they appear "bumpy" like a washboard due to their segmentation.
Adult: The butterfly is fairly small, with a wingspan of 7/8 to 1 1/8 inches. It is grayish brown on the upperside, and bright green to grayish green underneath. The underside of the forewing may have a grayish patch along the trailing edge. There may be a white stripe or line of white dots running across the fore- and hindwings on the underside. The wings are fringed with white. Although many hairstreaks have a thin tail extending off the hindwing, this species does not.

The species ranges from southern British Columbia and Alberta south through most of the Pacific Northwest and eastern California, and east to western Montana south to northern New Mexico. Isolated populations may be found in North Dakota, Nebraska and southeastern New Mexico. It occurs in patches throughout the state of Idaho.

It occurs in chaparral, woodlands, sagebrush steppe, and scrublands.


Caterpillar: Caterpillars eat the leaves of a variety of wild buckwheat (Eriogonum) species.
Adult: Butterflies drink flower nectar.

Usually there is one generation of caterpillars each summer. The caterpillars pupate, then overwinter within their chrysalises in a physiological state called diapause until spring. Adults generally fly from March to July.

Males perch to wait for receptive females to pass by. Females lay eggs singly on the leaves of host plants.

Idaho Status: Unprotected nongame species.
Global Rank: G5; populations are widespread, abundant, and secure.

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.