Small Dotted-Blue (Philotiella speciosa [Hy. Edwards])
Wing span: 5/8 - 7/8 inch (1.6 - 2.2 cm).
Identification: Tiny. Upperside of male pale lavender-blue with a narrow dark border; female is all brown. Underside white with large spots on forewing, small spots on hindwing.
Life history: Males patrol during the day to search for females. Eggs are laid singly on membranous sheaths beneath the flowers. Caterpillars eat Eriogonum flowers and the fleshy growths at the joints of Oxytheca. Chrysalids hibernate.
Flight: One brood from April-May.
Caterpillar hosts: Oxytheca and Eriogonum species in the buckwheat family (Polygonaceae).
Adult food: Flower nectar, usually that of the caterpillar hosts.
Habitat: Deserts, edges of dry desert lakes, stream edges in foothills.
Range: Local and uncommon. Western Nevada, eastern and southeastern California.
Conservation: Populations outside of the Mojave Desert region should be conserved, especially in the Sierra Nevada foothills (subspecies bohartorum).
The Nature Conservancy Global Rank: G4 - Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery.
Management needs: Determine effects of exotic plants and fire on extant populations.
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:
Bailowitz, R. A. and J. P. Brock. 1991. Butterflies of Southeastern Arizona. Tucson, Ariz.: Sonoran Arthropod Studies, Inc. Garth, J.S. 1950. Butterflies of Grand Canyon National Park. Grand Canyon Natural History Association, Grand Canyon, Ariz. 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.