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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 265 - 288 of 541 verified sightings
Observation date: Jul 05, 1985
Submitted by: legacy.reporter (Jim Brock)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: Jul 16, 1968
Submitted by: legacy.reporter (unknown)
Region: Modoc County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: Aug 07, 2010
Submitted by: plex1ppus
Region: Missoula County, Montana, United States
Verified by: stevekohler
Verified date: Apr 08, 2011
Observation date: Aug 22, 2010
Submitted by: Dwaine Wagoner
Region: Natrona County, Wyoming, United States
Verified by: paulopler
Verified date: Jan 25, 2011
Observation date: Jul 03, 1949
Submitted by: legacy.reporter (Floyd & June Preston)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 14, 1972
Submitted by: legacy.reporter (Clifford D. Ferris)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 04, 1984
Submitted by: Ken Davenport (Ken Davenport)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Aug 08, 1969
Submitted by: legacy.reporter (Ronald S. Wielgus)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jun 06, 1989
Submitted by: Ken Davenport (Ken Davenport)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Aug 08, 1967
Submitted by: legacy.reporter (Emmel, Shields & Ellis)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jun 28, 1969
Submitted by: legacy.reporter (Ronald S. Wielgus)
Region: Gila County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 15, 1973
Submitted by: legacy.reporter (Don Eff)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Aug 03, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Apache County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 05, 1984
Submitted by: Ken Davenport (Ken Davenport)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 10, 1953
Submitted by: legacy.reporter (unknown)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 10, 1953
Submitted by: legacy.reporter (unknown)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 11, 1963
Submitted by: legacy.reporter (Peter Herlan)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Aug 05, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Apache County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 05, 1969
Submitted by: legacy.reporter (Glen Gorelick)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jun 07, 1989
Submitted by: Ken Davenport (Ken Davenport)
Region: Coconino County, Arizona, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 29, 1945
Submitted by: legacy.reporter (unknown)
Region: Elko County, Nevada, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 01, 2011
Observation date: Jul 15, 2007
Submitted by: legacy.reporter (William Bouton)
Region: Sierra County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
Observation date: Sep 26, 2010
Submitted by: paulopler (Paul Opler)
Region: Teton County, Wyoming, United States
Verified by: paulopler (Paul Opler)
Verified date: Dec 31, 2010
Observation date: Jul 05, 1985
Submitted by: legacy.reporter (Jim Brock)
Region: Amador County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
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