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 1 - 24 of 541 verified sightings
Observation date: Oct 08, 2023
Submitted by: rajanrao
Region: Alpine County, California, United States
Verified by: Ken Davenport
Verified date: Oct 16, 2023
Observation date: Jul 23, 2020
Submitted by: Robb Hannawacker
Region: San Juan County, Utah, United States
Verified by: James Steen
Verified date: Sep 05, 2023
Observation date: Aug 15, 2023
Submitted by: Dobber31
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Aug 29, 2023
Observation date: Aug 04, 2023
Submitted by: weflybye
Region: Grays Harbor County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 06, 2023
Observation date: Jul 02, 2023
Submitted by: Kirsten Mills
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Jul 23, 2023
Observation date: Jul 13, 2023
Submitted by: hiker96
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 16, 2023
Observation date: Jul 11, 2023
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 12, 2023
Observation date: Jul 03, 2023
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Jul 03, 2023
Observation date: Jun 10, 2023
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 11, 2023
Observation date: Jul 25, 2022
Submitted by: gasigr
Region: Lake County, Oregon, United States
Verified by: Ken Davenport
Verified date: Mar 06, 2023
Observation date: Jul 20, 2022
Submitted by: Seth Mueller
Region: Mono County, California, United States
Verified by: Ken Davenport
Verified date: Mar 02, 2023
Observation date: Jul 27, 2022
Submitted by: stevecary
Region: La Plata County, Colorado, United States
Verified by: mikefisher
Verified date: Feb 19, 2023
Observation date: Aug 12, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Nov 04, 2022
Observation date: Aug 12, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Nov 04, 2022
Observation date: Aug 12, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Nov 04, 2022
Observation date: Aug 12, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Nov 04, 2022
Observation date: Jul 19, 2020
Submitted by: dbrudin
Region: La Plata County, Colorado, United States
Verified by: mikefisher
Verified date: Oct 02, 2022
Observation date: Aug 14, 2020
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Sep 10, 2022
Observation date: Aug 14, 2020
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: Paul Prappas
Verified date: Sep 10, 2022
Observation date: Aug 28, 2022
Submitted by: weflybye
Region: Grays Harbor County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 30, 2022
Observation date: Aug 20, 2022
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 25, 2022
Observation date: Aug 23, 2022
Submitted by: weflybye
Region: Mason County, Washington, United States
Verified by: davidwdroppers
Verified date: Aug 25, 2022
Observation date: Aug 12, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Aug 14, 2022
Observation date: Jul 29, 2022
Submitted by: jrmbutterfly
Region: British Columbia, Canada
Verified by: davidwdroppers
Verified date: Aug 10, 2022
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