Arrowhead Blue
Glaucopsyche piasus (Boisduval, 1852)
Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Checkered fringes. Upperside of male violet blue with a wide border; female duller. Underside gray with many small black spots. Hindwing with postmedian band of white "arrowheads" pointing inward.
Wing Span: 1 1/8 - 1 3/8 inches (2.9 - 3.5 cm).
Life History: Males patrol during the day near host plants. Females lay eggs on flower buds of host plant; caterpillars eat flowers and fruits. Chrysalids hibernate.
Flight: One brood from March-July.
Caterpillar Hosts: Lupine (Lupinus) and milkvetch (Astragalus) species in the pea family (Fabaceae).
Adult Food: Flower nectar.
Habitat: Coastal dunes and lowlands in California; mountains elsewhere: scrub, openings in woods, roadsides, trails, meadows, clearings, streamsides.
Range: Local and uncommon. British Columbia and southern Alberta south through the mountains of western North America to southern California, northern Arizona, and western Nebraska.
Conservation: Populations in southern California need assessment; elsewhere populations are probably not in jeopardy.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: Not reported.
Comments: NULL
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Verified Sightings
Displaying 145 - 168 of 525 verified sightings
Observation date: May 16, 1971
Submitted by: legacy.reporter (Fred T. Thorne)
Region: San Diego County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: May 17, 1969
Submitted by: legacy.reporter (Fred T. Thorne)
Region: San Diego County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 06, 2010
Observation date: Apr 09, 1960
Submitted by: legacy.reporter (D. Dirks, O. Shields)
Region: San Bernardino County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Apr 10, 1960
Submitted by: legacy.reporter (D. Dirks, O. Shields)
Region: San Bernardino County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Apr 28, 1995
Submitted by: legacy.reporter (Jeffrey Glassberg)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: unknown
Submitted by: legacy.reporter (William Barnes)
Region: Tulare County, California, United States
Verified by: legacy.verifier (J. A. Comstock)
Verified date: Jan 05, 2010
Observation date: Mar 25, 1923
Submitted by: legacy.reporter (J. A. Comstock)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Jun 13, 1921
Submitted by: legacy.reporter (Jean Gunder)
Region: San Bernardino County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Jan 05, 2010
Observation date: Apr 02, 1934
Submitted by: legacy.reporter (V. L. Clemence)
Region: San Luis Obispo County, California, United States
Verified by: legacy.verifier (John F. Emmel)
Verified date: Jan 04, 2010
Observation date: Mar 12, 1923
Submitted by: legacy.reporter (unknown)
Region: Los Angeles County, California, United States
Verified by: legacy.verifier (William H. Howe)
Verified date: Dec 17, 2009
Observation date: Jul 14, 1934
Submitted by: legacy.reporter (Edmund Godwin?)
Region: Mariposa County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jul 01, 1933
Submitted by: legacy.reporter (John S. Garth)
Region: Mariposa County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jun 09, 1962
Submitted by: legacy.reporter (Oakley Shields)
Region: Mariposa County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jul 09, 1934
Submitted by: legacy.reporter (Edmund Godwin?)
Region: Mariposa County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Jun 13, 1962
Submitted by: legacy.reporter (Oakley Shields)
Region: Mariposa County, California, United States
Verified by: legacy.verifier (Garth & Tilden)
Verified date: Dec 16, 2009
Observation date: Apr 12, 2000
Submitted by: Ken Davenport (Ken Davenport)
Region: Ventura County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 13, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Inyo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 12, 2005
Submitted by: Ken Davenport (Ken Davenport)
Region: Inyo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 12, 2005
Submitted by: Ken Davenport (Ken Davenport)
Region: Inyo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: May 09, 2007
Submitted by: Ken Davenport (Ken Davenport)
Region: Tulare County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 30, 2007
Submitted by: Ken Davenport (Ken Davenport)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Jun 16, 2006
Submitted by: Ken Davenport (Ken Davenport)
Region: Tulare County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 13, 1994
Submitted by: Ken Davenport (Ken Davenport)
Region: Inyo County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
Observation date: Apr 26, 2007
Submitted by: Ken Davenport (Ken Davenport)
Region: Los Angeles County, California, United States
Verified by: Ken Davenport (Ken Davenport)
Verified date: Oct 19, 2009
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