North American Butterflies and Moths List

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Butterflies of North America

Butterflies of Montana

Wyoming Satyr (Neominois wyomingo)
JPG -- species photo

Wyoming Satyr (Neominois wyomingo [J. Scott])

Wing span: 1 1/2 - 1 3/4 inches (3.7 - 4.3 cm).

Identification: Upperside is gray with cream-colored patches across both wings; forewing has 2 black spots. Underside is similar but lighter. Essentially identical to Riding's Satyr.

Life history: Males perch and patrol in grassy flats and slopes near the bottoms of prairie hills to seek females. Life history not reported.

Flight: One flight from mid-August to late September.

Caterpillar hosts: Wheatgrasses, possibly other grasses.

Adult food: Rabbitbrush and likely other flowers.

Habitat: Short-grass prairie, and grasslands with some areas of bare soil.

Range: Southern Montana south through Wyoming to northern Colorado. Also central Utah.

Comment: Although identical to Ridings' Satyr, this butterfly flies too soon after Ridings' Satyr's flight to be its offspring. Also the fact of its differing mate location behavior and possible host difference support its likely reproductive isolation and recognition as a separate species.

Conservation: All known populations should be monitored. Most are cattle range not threatened in any way. Most likely, after its range is investigated it rank may be lowered to G4 or G5.

The Nature Conservancy Global Rank: G3G4 - Very rare or local throughout its range or found locally in a restricted range OR Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery.

Management needs: None reported.


Opler, P.A. 1999. A field guide to western butterflies.  Houghton-Mifflin Co., 
     Boston, Mass. 540 pages, 44 color plates.

Scott, J.A. 1998. New western North American butterflies. Papilio, new series.
     #11, 12 pages.

Author: Paul A. Opler

State and Regional References:

Elrod, M.J. 1906. The Butterflies of Montana. Bulletin of the University of
     Montana 30: 1-174.

Ferris, C.D. and F.M. Brown. 1980. Butterflies of the Rocky Mountain States. 
     University of Oklahoma Press. Norman.

Layberry, R.A., Hall, P.W. & Lafontaine, D.J., 1998.  The Butterflies of 
     Canada.  University of Toronto Press, Toronto, ON.  280 pp. 

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.
Wyoming Satyr (Neominois wyomingo)
distribution map
map legend

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