(Grote & Robinson, 1819)
Callophrys henrici, the Henry's elfin or woodland elfin, is a North American butterfly in the family Lycaenidae. In Canada it is found from southern Manitoba to southern Nova Scotia. It has two main groups of populations in the United States; the first is found along the Atlantic Coast and uses various hollies (Ilex) as host plants; and the second is found mainly in the north and the Appalachians where they use redbud (Cercis canadensis) as a host plant. Henry's elfin is increasing in New England because of an introduced buckthorn (Rhamnus cathartica) it now uses as a host plant.
The upperside of the wings is a dark brown color. The underside of the wings is strongly two toned with the basal area being dark brown black. The hindwing postmedian line has white at both ends. The outer edge of the hindwing is frosted and the outer edge of the forewing is sometimes green toned. The hindwing has tails that are short and stubby. In the southeast, these tails are longer. The male lacks a stigma. Henry's elfin's wingspan measures 20 to 25 mm (0.79 to 0.98 in)
The frosted elfin is slightly larger, males have a stigma, the underside of the hindwing has more frosting, and there is usually a dark spot near the hindwing outer margin.
The brown elfin is more reddish brown, males have a stigma, it lacks hindwing tails, and the underside of the hindwing has no frosting.
The hoary elfin is smaller, males have a stigma, it lacks hindwing tails, the underside of the hindwing outer margin is completely frosted, and the forewing outer margin is also frosted.
Males perch at about human eye level to await females.(Males will sometimes perch high in tree tops or will perch very low to the ground.) Females lay their eggs singly on the host plant flower buds or on host plant leaves near the buds. The eggs are pale green but turn a whitish color before hatching. The larva is quite variable. It varies from greenish yellow to red brown to maroon. It has subdorsal spots that may be white, yellow, green, or red green and has a lateral stripe which may be yellow or a reddish color. Some individuals have a faint yellow or reddish middorsal stripe. The pupa is orange brown and is mottled with a dark brown-black color. The pupa hibernates in leaf litter. Henry's elfin has one brood per year.
Host plants used by Henry's elfin:
- Texas mescalbean, Calia secundiflora
- Redbud, Cercis canadensis
- Texas persimmon, Diospyros texana
- Black huckleberry, Gaylussacia baccata
- Dahoon holly, Ilex cassine
- American holly, Ilex opaca
- Yaupon holly, Ilex vomitoria
- Texas bluebonnet, Lupinus texensis
- Wild plum, Prunus americana
- Pin cherry, Prunus pensylvanica
- Black cherry, Prunus serotina
- Northern highbush blueberry, Vaccinium corymbosum
- Dryland blueberry, Vaccinium pallidum
- Vaccinium vacillans
- Maple-leaf viburnum, Viburnum acerifolium
- Black buckthorn, Rhamnus frangula
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- James A. Scott (1986). The Butterflies of North America. Stanford University Press, Stanford, CA. ISBN 0-8047-2013-4
- Henry's Elfin, Butterflies of Canada
- Rick Cech and Guy Tudor (2005). Butterflies of the East Coast. Princeton University Press, Princeton, NJ. ISBN 0-691-09055-6
- Jim P. Brock and Kenn Kaufman (2003). Butterflies of North America. Houghton Mifflin, New York, NY. ISBN 0-618-15312-8
- Ernest M. Shull (1987). The Butterflies of Indiana. Indiana Academy of Science. ISBN 0-253-31292-2
- David L. Wagner (2005). Caterpillars of Eastern North America. Princeton University Press, Princeton, NJ. ISBN 0-691-12144-3
- Thomas J. Allen, Jim P. Brock and Jeffrey Glassberg (2005). Caterpillars in the Field and Garden. Oxford University Press, New York, NY. ISBN 978-0-19-514987-6