Dotted Checkerspot (Poladryas minuta [W. H. Edwards])
Wing span: 1 1/4 - 1 7/8 inches (3.2 - 4.8 cm).
Identification: Upperside bright red-orange with submarginal band of small crescents. Underside orange. Hindwing outer margin with row of white spots and then a row of white crescents bordered with black. White median band has thin black line or 2 rows of black spots.
Life history: Males perch on low plants on ridgetop openings during the morning hours; in the afternoons they patrol around flowers. Females lay eggs in batches on the underside of host plant leaves. Caterpillars eat leaves and feed together in groups when they are young. Hibernation is by the third-stage caterpillars.
Flight: Several flights from January-September.
Caterpillar hosts: Various beardtongues (Penstemon species) in the figwort family (Scrophulariaceae).
Adult food: Nectar from flowers including yellow composites.
Habitat: Foothill ridges, grasslands, open mountain meadows.
Range: Western Nebraska, southeast Wyoming, and eastern Nevada south through south-central Texas, New Mexico, Arizona south to southern Mexico. Isolated population in southern Sierra Nevada of California.
Conservation:Not usually of conservation concern, but ssp. monache and minuta are of restricted range or in need of monitoring.
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: None reported.
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. Opler, P.A. 1999. A field guide to western Butterflies. Houghton Mifflin Co., Boston. 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 and Paul Opler
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.