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 121 - 144 of 574 verified sightings
Observation date: Aug 10, 2017
Submitted by: Claire Christensen
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Sep 22, 2017
Observation date: Jul 21, 2017
Submitted by: dsperanza
Region: Powell County, Montana, United States
Verified by: J_Martineau
Verified date: Jul 24, 2017
Observation date: Jun 04, 2017
Submitted by: reginacohn
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 04, 2017
Observation date: May 23, 2017
Submitted by: wimvdam
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: May 27, 2017
Observation date: May 26, 2017
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 27, 2017
Observation date: Jun 10, 2016
Submitted by: ncrosbyrd
Region: Kern County, California, United States
Verified by: Ken Davenport
Verified date: Jul 21, 2016
Observation date: Jun 12, 2016
Submitted by: Jdammarell
Region: Lincoln County, Washington, United States
Verified by: davidwdroppers
Verified date: Jun 13, 2016
Observation date: May 27, 2016
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2016
Observation date: May 27, 2016
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2016
Observation date: May 11, 2016
Submitted by: Bdog
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 13, 2016
Observation date: Jul 19, 2015
Submitted by: Paul Prappas
Region: British Columbia, Canada
Verified by: Norbert Kondla
Verified date: Aug 15, 2015
Observation date: Jun 13, 2015
Submitted by: diwalks2@gmail.com
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 18, 2015
Observation date: Aug 01, 2014
Submitted by: plex1ppus
Region: Stevens County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 10, 2014
Observation date: Jun 09, 2014
Submitted by: Bleem
Region: Orange County, California, United States
Verified by: Ken Davenport
Verified date: Jun 20, 2014
Observation date: Jun 09, 2014
Submitted by: Robert Gorman
Region: Orange County, California, United States
Verified by: Ken Davenport
Verified date: Jun 14, 2014
Observation date: Aug 02, 2011
Submitted by: Twitcherette
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Dec 20, 2013
Observation date: Aug 03, 2013
Submitted by: davidwdroppers
Region: Kittitas County, Washington, United States
Verified by: davidwdroppers
Verified date: Oct 01, 2013
Observation date: Aug 17, 2013
Submitted by: joeschelling
Region: Sandoval County, New Mexico, United States
Verified by: stevecary
Verified date: Aug 19, 2013
Observation date: Jul 28, 2013
Submitted by: plex1ppus
Region: Spokane County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 02, 2013
Observation date: Jun 18, 2013
Submitted by: Josiah Gilbert
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport
Verified date: Jul 14, 2013
Observation date: Jul 22, 2012
Submitted by: J_Martineau
Region: Sheridan County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 09, 2013
Observation date: Jul 21, 2012
Submitted by: swittwa
Region: Kittitas County, Washington, United States
Verified by: davidwdroppers
Verified date: Dec 17, 2012
Observation date: Jul 16, 1996
Submitted by: legacy.reporter (John B. Vernon)
Region: Pershing County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 01, 2012
Observation date: Aug 08, 1994
Submitted by: legacy.reporter (Ray & Kit Stanford)
Region: Maricopa County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 01, 2012
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