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 73 - 96 of 560 verified sightings
Observation date: Jul 15, 2020
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 17, 2020
Observation date: Jul 16, 2020
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 16, 2020
Observation date: Jul 02, 2020
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 02, 2020
Observation date: Jun 23, 2020
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 25, 2020
Observation date: Jul 07, 2019
Submitted by: Joshua C
Region: Sandoval County, New Mexico, United States
Verified by: stevecary
Verified date: Nov 07, 2019
Observation date: Sep 06, 2019
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Sep 08, 2019
Observation date: Aug 24, 2019
Submitted by: tirvine2020
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Aug 28, 2019
Observation date: Aug 12, 2019
Submitted by: Thomas Road
Region: Chelan County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 13, 2019
Observation date: Jul 25, 2019
Submitted by: Robert Gorman
Region: Orange County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2019
Observation date: Jul 03, 2019
Submitted by: Lisahug
Region: Plumas County, California, United States
Verified by: Ken Davenport
Verified date: Jul 14, 2019
Observation date: Jul 06, 2019
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 07, 2019
Observation date: Jun 24, 2019
Submitted by: Lisahug
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jun 27, 2019
Observation date: Jun 21, 2019
Submitted by: kmkurtz
Region: Okanogan County, Washington, United States
Verified by: davidwdroppers
Verified date: Jun 23, 2019
Observation date: Jun 09, 2019
Submitted by: Lisahug
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jun 11, 2019
Observation date: Jun 03, 2019
Submitted by: ezeemonee
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2019
Observation date: Jun 03, 2019
Submitted by: ezeemonee
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2019
Observation date: Jul 09, 2018
Submitted by: Scott Burgess
Region: Trinity County, California, United States
Verified by: Ken Davenport
Verified date: May 29, 2019
Observation date: Jul 30, 2008
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: J_Martineau
Verified date: May 15, 2019
Observation date: Jul 21, 2018
Submitted by: davidwdroppers
Region: Kittitas County, Washington, United States
Verified by: davidwdroppers
Verified date: Dec 07, 2018
Observation date: Sep 05, 2018
Submitted by: davidwdroppers
Region: Snohomish County, Washington, United States
Verified by: davidwdroppers
Verified date: Dec 07, 2018
Observation date: Aug 28, 2018
Submitted by: randimal
Region: Kittitas County, Washington, United States
Verified by: davidwdroppers
Verified date: Sep 01, 2018
Observation date: Jul 10, 2017
Submitted by: dlister
Region: Douglas County, Nevada, United States
Verified by: Ken Davenport
Verified date: Aug 15, 2018
Observation date: Aug 05, 2018
Submitted by: hiker96
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 06, 2018
Observation date: Jul 22, 2018
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 27, 2018
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