Unsilvered Fritillary
Speyeria adiaste (W.H. Edwards, 1864)
Family: Nymphalidae
Subfamily: Heliconiinae
Identification: Upperside of male pale reddish-tan to bright brick red; female larger and paler than male. Dark markings scattered and small except for bold postmedian line. Underside pale yellow to gray. Hindwing spots unsilvered and barely contrasting with background color.
Wing Span: 2 - 2 3/8 inches (5 - 6.1 cm).
Life History: Eggs are laid singly on fallen leaves and twigs near violets. First-stage caterpillars hibernate unfed, feeding on violet leaves in the spring.
Flight: One flight from June-July.
Caterpillar Hosts: Violets including Viola quercetorum.
Adult Food: Flower nectar.
Habitat: Openings in redwood and coniferous forests, oak woodlands, chaparral.
Range: Very local, restricted range in California County north to San Mateo County; east to north Los Angeles County and Kern County.
Conservation: Subspecies atossa is extinct; subspecies adiaste has a limited range and may be in jeopardy; while subspecies clemencei has the most extensive range.
NCGR: G3 - Very rare or local throughout its range or found locally in a restricted range (21 to 100 occurrences). (Threatened throughout its range).
Management Needs: Inventory and monitor subspecies adiaste populations and make conservation assessment.
Comments: NULL
Verified Sightings
Displaying 1 - 24 of 74 verified sightings
Observation date: Jun 18, 2020
Submitted by: jhintermeister
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Aug 08, 2020
Observation date: Jul 12, 2016
Submitted by: Nancy Asquith
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Jul 20, 2016
Observation date: Jul 09, 2016
Submitted by: dharlette
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Jul 13, 2016
Observation date: Jun 30, 2014
Submitted by: Josiah Gilbert
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Jan 02, 2015
Observation date: May 27, 1923
Submitted by: legacy.reporter (unknown)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: Jun 10, 1923
Submitted by: legacy.reporter (John A. Comstock)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: Jun 25, 1930
Submitted by: legacy.reporter (unknown)
Region: Kern County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: Jun 28, 2007
Submitted by: legacy.reporter (Ray Collett)
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: May 01, 2011
Observation date: May 27, 1923
Submitted by: legacy.reporter (unknown)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
Observation date: Jun 28, 2007
Submitted by: legacy.reporter (Ray Collett)
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
Observation date: Jun 10, 1923
Submitted by: legacy.reporter (John A. Comstock)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
Observation date: Jun 25, 2030
Submitted by: legacy.reporter (unknown)
Region: Kern County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Dec 31, 2010
Observation date: unknown
Submitted by: BAMONA
Region:
Verified by: BAMONA
Verified date: Sep 06, 2010
Observation date: Jun 10, 1981
Submitted by: legacy.reporter (Michael Smith)
Region: Monterey County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Mar 09, 2010
Observation date: Jul 16, 1976
Submitted by: legacy.reporter (R. Gardner)
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 07, 2010
Observation date: Jun 06, 1976
Submitted by: legacy.reporter (Michael Smith)
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 07, 2010
Observation date: Jul 04, 1976
Submitted by: legacy.reporter (Michael Smith)
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 07, 2010
Observation date: Jun 03, 1973
Submitted by: legacy.reporter (William Swisher)
Region: Monterey County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jun 16, 1971
Submitted by: legacy.reporter (William Swisher)
Region: Monterey County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jun 11, 1969
Submitted by: legacy.reporter (James R. Mori)
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Jun 15, 1951
Submitted by: legacy.reporter (Unknown)
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Jun 19, 1997
Submitted by: legacy.reporter (Jeffrey Glassberg)
Region: Monterey County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Jul 04, 1975
Submitted by: legacy.reporter (Jim Brock)
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 04, 2010
Observation date: Jun 30, 1922
Submitted by: legacy.reporter (Victor Clemence)
Region: San Luis Obispo County, California, United States
Verified by: legacy.verifier (J. A. Comstock)
Verified date: Jan 04, 2010
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