Intermediate Dotted-Blue (Euphilotes intermedia [Barnes and McDunnough])
Wing span: 3/4 inches (1.9 - 2.0 cm).
Identification: Male blue with orange hindwing aurora restricted to outer corner. Female brown with orange aurora band. Underside with weak black line at margins of wings. Orange band at outer margin of hindwing often broken into separate elements.
Life history: Males patrol all day near host plants to find receptive females. Eggs are laid singly on host plant flowers; caterpillars eat flowers and fruits, and are protected by ants. Chrysalids hibernate in sand or leaf litter.
Flight: One flight; late June to mid-August.
Caterpillar hosts: Sulphur-flower and Lobb's Buckwheat.
Adult food: Flower nectar especially that from Eriogonum species.
Habitat: Rocky slopes and flats.
Range: Western Oregon south to northern California. Isolated population in northern Arizona.
Conservation: No needs reported.
The Nature Conservancy Global Rank: G4, G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management needs: None reported.
Emmel, T.C., editor. 1998. Systematics of Western North American Butterflies. Mariposa Press, Gainesville, Fla. 878 pp. Garth, J.S. and J.W. Tilden. 1986.California Butterflies. University of California Press, Berkeley and Los Angeles. 246 pp, 24 plates. Opler, P.A. 1999. A field guide to western butterflies. Houghton-Mifflin Co., Boston, Mass. 540 pages, 44 color plates. Scott, J. A. 1986. The butterflies of North America. Stanford University Press, Stanford, Calif. 583 pages, 64 color plates. Stanford, R. E. and P. A. Opler. 1993. Atlas of western USA butterflies including adjacent parts of Canada and Mexico. Denver and Fort Collins, CO.
Author: Paul A. Opler
State and Regional References:
Dornfeld, E. J. 1980. The Butterflies of Oregon. Forest Grove, Ore., Timber Press. Hinchliff, J. 1994. An atlas of Oregon Butterflies. Oregon State University Bookstore, Corvallis. Hinchliff, J. 1994. The distribution of the butterflies of Oregon. Evergreen Aurelians. Oregon State University Bookstore, Corvallis, 176 pp. + map. 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.