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 49 - 72 of 560 verified sightings
Observation date: Jul 11, 2022
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 16, 2022
Observation date: May 10, 2019
Submitted by: camflies
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jul 06, 2022
Observation date: May 22, 2022
Submitted by: camflies
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: May 25, 2022
Observation date: May 27, 2019
Submitted by: Twitcherette
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Apr 21, 2022
Observation date: Jun 08, 2018
Submitted by: Mark Salvato
Region: San Benito County, California, United States
Verified by: Ken Davenport
Verified date: Oct 11, 2021
Observation date: Jul 14, 2021
Submitted by: tjay13
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Sep 11, 2021
Observation date: Aug 24, 2021
Submitted by: weflybye
Region: Grays Harbor County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 26, 2021
Observation date: Aug 18, 2021
Submitted by: weflybye
Region: Grays Harbor County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 19, 2021
Observation date: Aug 10, 2021
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 12, 2021
Observation date: Aug 03, 2021
Submitted by: twofried
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Aug 04, 2021
Observation date: Jul 12, 2021
Submitted by: joeschelling
Region: Sandoval County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 16, 2021
Observation date: Jul 14, 2021
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 14, 2021
Observation date: Jul 09, 2021
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 11, 2021
Observation date: Jul 07, 2021
Submitted by: twofried
Region: New Mexico, United States
Verified by: stevecary
Verified date: Jul 10, 2021
Observation date: Jul 07, 2021
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 08, 2021
Observation date: Jul 03, 2021
Submitted by: Cactuswren1976
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 08, 2021
Observation date: Jun 29, 2021
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jun 30, 2021
Observation date: Jun 20, 2021
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 20, 2021
Observation date: Jun 11, 2021
Submitted by: jhintermeister
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Jun 14, 2021
Observation date: May 29, 2021
Submitted by: bjones7777
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2021
Observation date: Jun 06, 2021
Submitted by: ezeemonee
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jun 07, 2021
Observation date: May 08, 2016
Submitted by: camflies
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jan 25, 2021
Observation date: Aug 10, 2020
Submitted by: AaronB
Region: Montana, United States
Verified by: J_Martineau
Verified date: Aug 15, 2020
Observation date: Jul 21, 2020
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 22, 2020
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