Northwestern Fritillary
Speyeria hesperis (W.H. Edwards, 1864)
Family: Nymphalidae
Subfamily: Heliconiinae
Identification: Quite variable. Upperside orange-brown, often darker at base, with black outer margins especially on forewing; male has black scales on veins. Underside of hindwing with basal disk or light brown orange-brown with pale submarginal band; spots silvered or unsilvered.
Wing Span: 2 - 2 3/4 inches (5 - 7 cm).
Life History: Males patrol during the day in open areas. Eggs are laid singly on leaf litter near host plant. Unfed first-stage caterpillars overwinter, emerging in spring to feed on leaves.
Flight: One flight from June-October, mainly July-August.
Caterpillar Hosts: Violets.
Adult Food: Flower nectar including Gaillardia, rabbitbrush, purple mints, and shrub cinquefoil.
Habitat: Forest openings, meadows, and open hillsides.
Range: Western mountains from central western Alaska, Yukon, and Northwest Territories south to central California, Arizona, and New Mexico.
Conservation: Not usually of conservation concern. Subspecies elko Austin and hanseni Emmel and Emmel are of conservation concern because of their small ranges. The former may be threatened by invasive alien weeds including smooth brome and/or cheatgrass.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
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Verified Sightings
Displaying 337 - 360 of 544 verified sightings
Observation date: Jul 12, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 15, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 15, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 08, 1996
Submitted by: Ken Davenport (Ken Davenport)
Region: Siskiyou County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 12, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Aug 03, 1934
Submitted by: legacy.reporter (Edmund Godwin)
Region: Tuolumne County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jul 14, 1956
Submitted by: legacy.reporter (John S. Garth)
Region: Tuolumne County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jul 09, 1996
Submitted by: Ken Davenport (Ken Davenport)
Region: Siskiyou County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 12, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Tuolumne County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 15, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 19, 1981
Submitted by: legacy.reporter (Ralph Wells)
Region: Calaveras County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Aug 19, 1961
Submitted by: legacy.reporter (Oakley Shields)
Region: Madera County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jul 08, 1987
Submitted by: Ken Davenport (Ken Davenport)
Region: Tuolumne County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 12, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 16, 1974
Submitted by: legacy.reporter (James R. Mori)
Region: Mono County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Aug 03, 1961
Submitted by: ray.stanford@st... (Ray Stanford)
Region: Madera County, California, United States
Verified by: legacy.verifier (Ray Stanford)
Verified date: Dec 16, 2009
Observation date: Jul 08, 1996
Submitted by: Ken Davenport (Ken Davenport)
Region: Siskiyou County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 12, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Tuolumne County, California, United States
Verified by: legacy.verifier (Ken Davenoort)
Verified date: Dec 16, 2009
Observation date: Jul 13, 1986
Submitted by: Ken Davenport (Ken Davenport)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 16, 2009
Observation date: Jul 07, 1997
Submitted by: legacy.reporter (C. Bordelon & E. Knudson)
Region: Graham County, Arizona, United States
Verified by: legacy.verifier (The Lepidopterists' Society Season Summary)
Verified date: Jan 28, 2009
Observation date: Jul 19, 2008
Submitted by: legacy.reporter (Paul Opler and Evi Buckner-Opler)
Region: Teton County, Wyoming, United States
Verified by: paulopler (Paul Opler)
Verified date: Sep 29, 2008
Observation date: Jun 28, 2008
Submitted by: legacy.reporter (Sonja Mendoza and Mike Bradford)
Region: Socorro County, New Mexico, United States
Verified by: paulopler (Paul Opler)
Verified date: Sep 29, 2008
Observation date: Aug 08, 1932
Submitted by: legacy.reporter (C.C. Albright)
Region: Toole County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Jul 04, 1964
Submitted by: legacy.reporter (John Goosey)
Region: Sweet Grass County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
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