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Butterflies of Nebraska -- Colias eurytheme

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Butterflies of Nebraska

Orange Sulphur (Colias eurytheme)
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Orange Sulphur (Colias eurytheme Boisduval)

Wing span: 1 3/8 - 2 3/4 inches (3.5 - 7 cm).

Identification: Quite variable. Upperside of male yellow with orange overlay, yellow veins, wide black border, and dark black cell spot. Female yellow or white with irregular black border surrounding light spots. Underside hindwing spot silver with 2 concentric dark rings, and a spot above it.

Life history: Males patrol for receptive females, who lay eggs singly on top of host plant leaves. Most feeding takes place at night. Young caterpillars chew holes in the tops of leaves, then later feed from the leaf tip. Older caterpillars eat half of the leaf before moving to the other half. Chrysalids overwinter.

Flight: Two-three flights in the north from June-October, 4-5 in the south from March-November.

Caterpillar hosts: Plants in the pea family (Fabaceae) including alfalfa (Medicago sativa), white clover (Trifolium repens), and white sweet clover (Melilotus alba).

Adult food: Nectar from many kinds of flowers including dandelion, milkweeds, goldenrods, and asters.

Habitat: A wide variety of open sites, especially clover and alfalfa fields, mowed fields, vacant lots, meadows, road edges.

Range: Southern Canada to central Mexico, coast to coast in the United States except for the Florida peninsula.

Comments: One of the most widespread and common butterflies in North America.

Conservation: Not required.

Management needs: Caterpillars can be very destructive in alfalfa fields.

The Nature Conservancy Global Rank: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

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:

Dankert, N., Nagel, H., and T. Nightengale. 1993. Butterfly Distribution Maps- 
     Nebraska. University of Nebraska, Kearney.

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.
Orange Sulphur (Colias eurytheme)
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