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Butterflies of Maine -- Speyeria idalia

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Butterflies of North America

Butterflies of Maine

Regal Fritillary (Speyeria idalia)
JPG -- species photo

Regal Fritillary (Speyeria idalia [Drury])

Wing span: 2 5/8 - 4 1/8 inches (6.7 - 10.5 cm).

Identification: Large. Upperside of forewing bright red-orange with black markings. Upperside of hindwing black with postmedian row of white spots; submarginal row of spots is orange in male and white in female.

Life history: Males patrol for females with a low, steady flight. Females walk through vegetation to lay single eggs on various plants, even if the host violets are not present. Most eggs are laid in August. The caterpillars hatch and overwinter unfed; in spring they eat leaves of host plants.

Flight: One brood from mid-June to mid-August.

Caterpillar hosts: Violets including bird's foot violet (Viola pedata).

Adult food: Nectar from flowers of milkweeds, thistles, red clover, and mountain mint.

Habitat: Tall-grass prairie and other open sites including damp meadows, marshes, wet fields, and mountain pastures.

Range: Tall-grass prairie remnants in Montana and North Dakota south to Colorado, Nebraska, and Oklahoma; rare or absent from former range east of the Appalachians.

Conservation: Rapidly vanishing or declining in much of its range. A species of concern for the United States Fish and Wildlife Service. All populations should be 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: Monitor populations and manage populations on public lands and preserves.

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.

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:

Brower, A.E.  1974.  A List of the Lepidoptera of Maine - Part 1: The
     Macrolepidoptera.  Life Sciences and Agricultural Station, Univ. of Maine 
     at Orono.  Technical Bulletin No. 66.  136 pp.

Layberry, R.A., Hall, P.W. & Lafontaine, D.J., 1998.  The Butterflies of 
     Canada.  University of Toronto Press, Toronto, ON.  280 pp.
     
Opler, P.A. 1998. A field guide to eastern butterflies, revised format.
     Houghton Mifflin Co., Boston.      
Regal Fritillary (Speyeria idalia)
distribution map
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