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Butterflies of Colorado -- Celastrina humulus

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Butterflies of North America

Butterflies of Colorado

Hops Azure (Celastrina humulus)
JPG -- species photo

Hops Azure (Celastrina humulus Scott and D. Wright)

Wing span: 13/16 - 1 1/16 inches (2.1 - 2.9 cm).

Identification: Upperside of male powdery blue. Female with extensive black and iridescent blue variably invaded by white scaling. Underside of hindwing mostly white with few black spots or none.

Life history: Caterpillars eat flowers.

Flight: One flight from mid-June to early July just after flight of Spring Azure .

Caterpillar hosts: Hopes (Humulus japonica) and lupine in one drainage.

Adult food: Flower nectar.

Habitat: Mountain foothill canyons and ravines from about 5800-6500', usually associated with patches of hops.

Range: Colorado Front Range from Larimer County south to El Paso County.

Conservation: Habitat may be threatened by the spread of alien weeds and resultant wildfires.

The Nature Conservancy Global Rank: G3 - very rare or local throughout its range or found locally in a restricted range

Management needs: Survey habitats and protect them from alteration and exotic plants.

References:

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

Author: Jane M. Struttmann

State and Regional References:

Brown, F.M., Eff, J.D., and B. Rotger. 1957. Colorado Butterflies. Denver 
     Museum of Natural History, Denver.

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.
Hops Azure (Celastrina humulus)
distribution map
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