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San Emigdio Blue (Plebeius emigdionis [Grinnell])
Wing span: 7/8 - 1 1/8 inches (2.2 - 2.9 cm).
Identification: Upperside of male pale blue with wide brown border; hindwing with faint orange band at outer margin. Female brown with blue at wing bases and orange bands near outer margins. Underside of both sexes white with many small black spots; forewing postmedian band has 2 elongated spots.
Life history: Eggs are laid singly on leaves of the host plant. Caterpillars eat leaves and are tended by ants. Older caterpillars hibernate.
Flight: Three flights from April-September.
Caterpillar hosts: Shadscale (Atriplex canescens) in the goosefoot family (Chenopodiaceae).
Adult food: Not reported.
Habitat: Shadscale scrub in desert canyons and near washes.
Range: Very local in southern California from Inyo County south through the Mojave Desert, San Joaquin Valley, Bouquet and Mint Canyons, and Los Angeles County.
Conservation: Habitat of all populations should be monitored or conserved.
The Nature Conservancy Global Rank: G3 - Very rare or local throughout its range or found locally in a restricted range (21 to 100 occurrences). (Threatened throughout its range).
Management needs: Maintain habitat and protect from non-indigenous plants.
References:
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:
Brown, J.W., Real, H.G., and D.K. Faulkner. 1992. Butterflies of Baja
California. Lepidoptera Research Foundation, Beverly Hills, Calif.
Comstock, J.A. 1927. Butterflies of California. Privately published, Los
Angeles, Calif. [Facsimile available from Entomological Reprint
Specialists, Los Angeles, Calif.]
Dameron, W. 1997. Searching for butterflies in southern California.
Flutterby Press, Los Angeles, Calif.
Emmel, T.C. Editor. 1998. Systematics of western North American butterflies.
Mariposa Press, Gainesville, Florida.
Emmel, T. C. and J. F. Emmel. 1973. The Butterflies of Southern California.
Natural History Museum of Los Angeles County Science Series No. 26.
Garth, J.S. and J.W. Tilden. 1986. California Butterflies. California Natural
History Guide 51. University of California Press, Berkeley and Los
Angeles.
Langston, R.L. 1981. The Rhopalocera of Santa Cruz Island, California. Journal
of Research on the Lepidoptera 18: 24-35.
Miller, Scott E. 1985. Butterflies of the Califorenia Channel Islands. Journal
of the Research on the Lepidoptera 23: 282-296.
Opler, Paul A. 1999. Peterson Field Guide to Western Butterflies, revised
edition. Houghton Mifflin Co., Boston, Mass.
Orsak, L.J. 1977. The Butterflies of Orange County, California. Museum of
Systematic Biology, University of california, Irvine.
Stanford, R.E. and P.A. Opler. 1993. Atlas of Western USA Butterflies.
Privately published, Denver, Colo.
Steiner, J. 1990. Bay Area Butterflies: The Distribution and Natural History
of San Francisco Region Rhopalocera. Hayward, Calif.: Hayward State
University, Masters Thesis.
Tilden, J.W. and A.C. Smith. 1986. A Field Guide to Western Butterflies.
Houghton Mifflin Co., Boston, Mass.
Tilden, J.W. 1965. Butterflies of the San Francisco Bay Region. California
Natural History Guide 12. University of California Press, Berkeley and
Los Angeles.
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