North American Butterflies and Moths List

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Butterflies of North America

Butterflies of California

Uncas Skipper (Hesperia uncas)
JPG -- species photo

Uncas Skipper (Hesperia uncas W. H. Edwards)

Wing span: 1 1/8 - 1 5/8 inches (2.9 - 4.2 cm).

Identification: Wings are brownish orange. Underside of hindwing has white veins, white spots extended along the veins, and black submarginal patches.

Life history: Males perch on tops of small hills or mesas to await females. Females lay eggs singly on or near the host plants. Caterpillars eat leaves and take shelter in tied-up leaves.

Flight: One brood from June-July in high elevations; two broods from May-September in the remainder of the range.

Caterpillar hosts: Blue grama grass (Bouteloua gracilis) and needlegrass (Stipa).

Adult food: Flower nectar.

Habitat: Short-grass prairie, sagebrush, open woodland.

Range: High plains from central Alberta east to southern Manitoba; south to east-central California, southeast Arizona, west and north Texas; south to southern Mexico. A stray to southwest Iowa and eastern Minnesota.

Conservation: Not usually required.

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: None reported.

References:


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.



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. 



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.

Uncas Skipper (Hesperia uncas)
distribution map
map legend

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