North American Butterflies and Moths List

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U.S. Geological Survey

Butterflies of North America

Bartram's Scrub-Hairstreak (Strymon acis)
JPG -- species photo

Bartram's Scrub-Hairstreak (Strymon acis [Drury])

Wing span: 7/8 - 1 1/8 inches (2.2 - 2.9 cm).

Identification: Hindwing with 1 long and 1 short tail. Upperside dark gray. Underside light gray. Hindwing with wide straight postmedian band of white edged with black; 2 white spots near base of wing.

Life history: Eggs are laid singly on flower stalks of host plant. Young caterpillars eat upperside of leaves, flowers, and fruits; older caterpillars feed on leaves.

Flight: Three to four flights in Florida from February-November.

Caterpillar hosts: Narrow-leafed croton (Croton linearis) in the Euphorbiaceae family.

Adult food: Nectar from flowers of narrow-leafed croton and shepherd's needle.

Habitat: Pine forest openings.

Range: Southern Florida and the Keys, West Indies.

Conservation: All populations should be conserved.

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

Management needs: Prevent further loss of habitat. Ensure that host plant colonies remain in suitable condition.


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.

Author: Jane M. Struttmann

Bartram's Scrub-Hairstreak (Strymon acis)
distribution map
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