North American Butterflies and Moths List

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Butterflies of North America

Butterflies of Arizona

Eight-spotted Longtail (Polythrix octomaculata)

Eight-spotted Longtail (Polythrix octomaculata [Sepp])

Wing span: 1 3/8 - 1 13/16 inches (3.5 - 4.6 cm).

Identification: Females have long hindwing tails; males have shorter tails and no costal fold. Wings are brown; forewing with only 1 submarginal brown spot near the rear of the wing. Spot near the base of forewing underside is faint or absent; underside hindwing of female often has a smeared white patch.

Life history: Not reported. When inactive, adults perch under large leaves.

Flight: Many flights from March-November in Mexico; March and August-October in South Texas.

Caterpillar hosts: Tree and shrub legumes: Muellera, Toluifera, and Pterocarpus.

Adult food: Flower nectar.

Habitat: Shady areas and streams in tropical forest or scrub.

Range: Argentina north through tropical America to Mexico and Haiti. Occasionally strays to the lower Rio Grande Valley, Texas.

Conservation: Not necessary for a rare stray.

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

Management needs: None reported.


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.

Author: Jane M. Struttmann

State and Regional References:

Bailowitz, R. A. and J. P. Brock. 1991. Butterflies of Southeastern Arizona. 
     Tucson, Ariz.: Sonoran Arthropod Studies, Inc.

Garth, J.S. 1950. Butterflies of Grand Canyon National Park. Grand Canyon 
     Natural History Association, Grand Canyon, Ariz.

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.
Eight-spotted Longtail (Polythrix octomaculata)
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