Sylvan Hairstreak
Satyrium sylvinus (Boisduval, 1852)
Family: Lycaenidae
Subfamily: Theclinae
Identification: With or without tails. Upperside gray-brown or reddish with blue sheen; hindwing with small orange patch at lower edge. Female with yellowish tinge. Underside pale gray to white. Postmarginal band of small black dots; some individuals may have only a few spots. Yellow to red spot at hindwing lower edge.
Wing Span: 1 - 1 3/8 inches (2.5 - 3.5 cm).
Life History: Males perch on low vegetation near host plants to watch for females. Eggs are laid singly on stems of host plants where they hibernate until spring. Caterpillars feed on leaves.
Flight: One flight from May-August.
Caterpillar Hosts: Various willow (Salix) species.
Adult Food: Nectar from flowers including milkweed and Indian hemp.
Habitat: Willow thickets, open woodlands, streams, oases.
Range: British Columbia southeast to Wyoming, Colorado, New Mexico; south through California to Baja California Norte.
Conservation: Not usually required.
NCGR: G4 - Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
Comments: NULL
Alternate Scientific Names:
Satyrium sylvinum
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Verified Sightings
Displaying 193 - 216 of 574 verified sightings
Observation date: Jul 24, 1987
Submitted by: legacy.reporter (A. M. Shapiro)
Region: Siskiyou County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 25, 2010
Observation date: Jun 21, 1987
Submitted by: legacy.reporter (A. M. Shapiro)
Region: Siskiyou County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 25, 2010
Observation date: Jul 05, 1974
Submitted by: legacy.reporter (H. V. Reinhard)
Region: Marin County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 07, 2010
Observation date: Jul 01, 1974
Submitted by: legacy.reporter (H. V. Reinhard)
Region: Marin County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 07, 2010
Observation date: Jul 23, 1972
Submitted by: legacy.reporter (Bob Koyama)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Apr 01, 1968
Submitted by: legacy.reporter (Larry Orsak)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Aug 06, 1965
Submitted by: legacy.reporter (Kenneth Denton)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 05, 1948
Submitted by: legacy.reporter (Robert L. Langston)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 01, 1962
Submitted by: legacy.reporter (Kenneth Denton)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 20, 1967
Submitted by: legacy.reporter (Bob Koyama)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 01, 1969
Submitted by: legacy.reporter (Gary Felton)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 18, 1948
Submitted by: legacy.reporter (Robert L. Langston)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 06, 1971
Submitted by: legacy.reporter (Gordon Marsh)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 21, 1967
Submitted by: legacy.reporter (Bob Koyama)
Region: Orange County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: May 29, 1970
Submitted by: legacy.reporter (J. Emmel, P. Opler)
Region: Sonoma County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jul 18, 1960
Submitted by: legacy.reporter (Tom & John Emmel)
Region: Placer County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Aug 26, 1960
Submitted by: legacy.reporter (Tom & John Emmel)
Region: Placer County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Jun 20, 1997
Submitted by: legacy.reporter (Jeffrey Glassberg)
Region: Alameda County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Jun 23, 1922
Submitted by: legacy.reporter (J. A. Comstock)
Region: Los Angeles County, California, United States
Verified by: legacy.verifier (J. A. Comstock)
Verified date: Jan 04, 2010
Observation date: Jun 07, 1922
Submitted by: legacy.reporter (J. A. Comstock)
Region: Los Angeles County, California, United States
Verified by: legacy.verifier (J. A. Comstock)
Verified date: Jan 04, 2010
Observation date: unknown
Submitted by: legacy.reporter (John R. Heitzman)
Region: Inyo County, California, United States
Verified by: legacy.verifier (William H. Howe)
Verified date: Dec 17, 2009
Observation date: Jun 02, 1940
Submitted by: legacy.reporter (unknown)
Region: Alameda County, California, United States
Verified by: legacy.verifier (William H. Howe)
Verified date: Dec 17, 2009
Observation date: Jun 30, 1919
Submitted by: legacy.reporter (unknown)
Region: Los Angeles County, California, United States
Verified by: legacy.verifier (William H. Howe)
Verified date: Dec 17, 2009
Observation date: Jul 02, 1983
Submitted by: legacy.reporter (John G. Pasko)
Region: Inyo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 17, 2009
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