North American Butterflies and Moths List

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U.S. Geological Survey

Butterflies of North America

Ilavia Hairstreak (Fixsenia ilavia)
JPG -- species photo

Ilavia Hairstreak (Fixsenia ilavia [Beutenmueller])

Wing span: 7/8 - 1 1/16 inches (2.2 - 2.8 cm).

Identification: Two tails on each hindwing. Underside of hindwing pale brown-tan; blue tail-spot capped narrowly with orange usually reduced or absent; white-edged black W near inner margin faint or absent.

Life history: Eggs are laid singly on host plant twigs and hatch the following spring. Caterpillars feed on leaves, buds, and male catkins

Flight: One flight from March-June.

Caterpillar hosts: Scrub oak..

Adult food: Flower nectar.

Habitat: Oak brush sometimes mixed with junipers, cactus, and other plants.

Range: Central and southeastern Arizona.

Conservation: Not usually required.

The Nature Conservancy Global Rank: G4, G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.

Management needs: None reported.


Bailowitz, R. A., and J. P. Brock. 1991. Butterflies of southeastern Arizona. 
     Sonoran Arthropod Studies, Inc., Tucson, Arizona. 342 pages.

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: Paul A. Opler

Ilavia Hairstreak (Fixsenia ilavia)
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