Silver-bordered Fritillary (Boloria selene [Denis & Schiffermüller])
Wing span: 1 3/8 - 2 1/8 inches (3.5 - 5.4 cm).
Identification: Upperside orange with black markings. Underside of hindwing with rows of metallic silver spots; postmedian spots small and black.
Life history: Males patrol wet areas for females. Eggs are laid singly near host plants. Caterpillars feed on leaves; third-stage caterpillars hibernate.
Flight: One flight from June-July in the north, two to three flights from May-September in the east.
Caterpillar hosts: Violets including Viola glabella and V. nephrophylla.
Adult food: Favorite nectar sources are composite flowers, including goldenrod and black-eyed susans.
Habitat: Wet meadows, bogs, marshes.
Range: Holarctic. Central Alaska southeast through Canada south of the taiga; northern United States from central Washington south along Rocky Mountains to northern New Mexico; east to Illinois, Virginia, and Maryland.
Conservation: Not usually of concern, but isolated populations in plains and east of the Cascades should be conserved.
The Nature Conservancy Global Rank: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management needs: Protect habitat of selected populations.
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. Tilden, J. W. 1986. A field guide to western butterflies. Houghton-Mifflin Co., Boston, Mass. 370 pages, 23 color plates.
Author: Jane M. Struttmann
State and Regional References:
Glassberg, J. 1993. Butterflies Through Binoculars: A Field Guide to Butterflies in the Boston-New York-Washington Region. Oxford Univ. Press, New York, N.Y. 160 pp. Layberry, R.A., Hall, P.W. & Lafontaine, D.J., 1998. The Butterflies of Canada. University of Toronto Press, Toronto, ON. 280 pp. Opler, P.A. 1998. A field guide to eastern butterflies, revised format. Houghton Mifflin Co., Boston. Shapiro, A.M. 1966. Butterflies of the Delaware Valley. American Entomological Society Special Publication. Philadelphia, PA. 79 pp. Tietz, H.M. 1952. The Lepidoptera of Pennsylvania. The Pennsylvania State College School of Agriculture Agricultural Experiment Station. State College, PA. 194 pp. Wright, D.M. 1995, Atlas of Pennsylvania Butterflies. Special Private Publication, Lansdale, PA. 22 pp.