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 361 - 384 of 544 verified sightings
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
Observation date: Aug 21, 1986
Submitted by: stevekohler (Steve Kohler)
Region: Treasure County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Aug 22, 1979
Submitted by: legacy.reporter (Robert M. Pyle)
Region: Teton County, Montana, United States
Verified by: legacy.verifier (Robert M. Pyle)
Verified date: Feb 04, 2008
Observation date: Jun 01, 1900
Submitted by: legacy.reporter (C.A. Wiley)
Region: Custer County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 21, 1922
Submitted by: legacy.reporter (unknown)
Region: Hill County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 21, 1931
Submitted by: legacy.reporter (F.J. Albright)
Region: Meagher County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 16, 1957
Submitted by: legacy.reporter (Miller)
Region: Sanders County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Jul 05, 1956
Submitted by: legacy.reporter (A. Moeck)
Region: Blaine County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Jul 01, 1903
Submitted by: legacy.reporter (Morton J. Elrod)
Region: Flathead County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Aug 01, 1904
Submitted by: legacy.reporter (Morton J. Elrod)
Region: Lake County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: unknown
Submitted by: legacy.reporter (G.E. Barnes)
Region: Park County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 16, 1966
Submitted by: legacy.reporter (W. Howe)
Region: Stillwater County, Montana, United States
Verified by: legacy.verifier (W. Howe)
Verified date: Feb 04, 2008
Observation date: Jun 17, 1931
Submitted by: legacy.reporter (C.C. Albright)
Region: Cascade County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 23, 1997
Submitted by: charleseharp (Chuck Harp)
Region: Golden Valley County, Montana, United States
Verified by: charleseharp (Chuck Harp)
Verified date: Feb 04, 2008
Observation date: Jul 17, 1972
Submitted by: legacy.reporter (Scott Ellis)
Region: Lincoln County, Montana, United States
Verified by: legacy.verifier (Scott Ellis)
Verified date: Feb 04, 2008
Observation date: Jul 25, 1959
Submitted by: legacy.reporter (T.W. Davies)
Region: Powell County, Montana, United States
Verified by: legacy.verifier (T.W. Davies)
Verified date: Feb 04, 2008
Observation date: Aug 10, 1983
Submitted by: stevekohler (Steve Kohler)
Region: Deer Lodge County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Aug 02, 1946
Submitted by: legacy.reporter (Stallings)
Region: Jefferson County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Aug 10, 1961
Submitted by: legacy.reporter (B. and S. Perkins)
Region: Mineral County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Jul 04, 1985
Submitted by: stevekohler (Steve Kohler)
Region: Sheridan County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jun 25, 1940
Submitted by: legacy.reporter (Harry Howland)
Region: Beaverhead County, Montana, United States
Verified by: legacy.verifier (Paul Grey)
Verified date: Feb 04, 2008
Observation date: Jul 15, 1985
Submitted by: stevekohler (Steve Kohler)
Region: Broadwater County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 02, 1901
Submitted by: legacy.reporter (E.G. Moore)
Region: Gallatin County, Montana, United States
Verified by: stevekohler (Steve Kohler)
Verified date: Feb 04, 2008
Observation date: Jul 28, 1959
Submitted by: legacy.reporter (T.W. Davies)
Region: Lewis And Clark County, Montana, United States
Verified by: legacy.verifier (T.W. Davies)
Verified date: Feb 04, 2008
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