Attributes of Cupido amyntula

Western Tailed-Blue
Cupido amyntula (Boisduval, 1852)

Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Narrow tail on hindwing. Upperside of male blue, female brown with blue at wing base. Underside white with black spots indistinct or lacking; single small orange spot near tail.
Wing Span: 7/8 - 1 1/8 inches (2.2 - 2.9 cm).
Life History: Males patrol and perch during the day. Females lay eggs on flowers or young seedpods of host plant. Caterpillars eat young seeds inside the pod, where they overwinter and pupate.
Flight: March-July. Several broods in southern California, a partial second brood in the southern Rocky Mountains, and one brood elsewhere.
Caterpillar Hosts: Legumes with inflated pods including false lupine (Thermopsis), milkvetch (Astragalus), crazyweed (Oxytropis), and vetches (Vicia and Lathyrus).
Adult Food: Flower nectar.
Habitat: Open - usually native - areas with low shrubs including chaparral, meadows, and open woodland.
Range: Alaska south through western North America and all western mountains to northern Baja California, east across Canada's prairie provinces to northern Michigan, Ontario, and the Gaspé Peninsula.
Conservation: Not usually required.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
Taxonomy Notes:

Images of Cupido amyntula

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Cupido amyntula - everes_amyntula_egg_raisingbutterflies.jpg

Cupido amyntula - everes_amyntula_egg_raisingbutterflies.jpg
Cupido amyntula - everes_amyntula_caterpillar2_raisingbutterflies.jpg

Cupido amyntula - everes_amyntula_caterpillar2_raisingbutterflies.jpg
Cupido amyntula - everes_amyntula_caterpillar3_raisingbutterflies.jpg

Cupido amyntula - everes_amyntula_caterpillar3_raisingbutterflies.jpg
Cupido amyntula - Everes_amyntulaSanders2.jpg

Cupido amyntula - Everes_amyntulaSanders2.jpg
Cupido amyntula - Everes_amyntulaSanders.jpg

Cupido amyntula - Everes_amyntulaSanders.jpg


The map below displays all BAMONA data for this species and has three different data layers:
1. All records (yellow dots)   2. Recently verified records (orange dots)*   3. US county records (purple)

There are also three base layers: 1. Satellite    2. Normal   3. Hybrid

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*The orange dots on the map provide access to information about the 400 most recently verified sightings of this species. Sometimes, there are several records at the same location. Use the table view to access these records.

By default, the fifty most recently verified sightings are below. Sort by Observation Date to see the most recent sightings, or filter the sightings by region to get a regional list.

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Observation Date Submitter Region Verified Datesort icon
January 01, 1950 legacy.reporter Alaska, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Mohave County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Coconino County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Coconino County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Navajo County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Apache County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Apache County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Yavapai County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Gila County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Graham County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Apache County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Pima County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Santa Cruz County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Cochise County, Arizona, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Alameda County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Alpine County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Amador County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Butte County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Calaveras County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Colusa County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Del Norte County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter El Dorado County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Glenn County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Humboldt County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Inyo County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Kern County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Kings County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Lake County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Lassen County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Los Angeles County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Madera County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Marin County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Mariposa County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Mendocino County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Modoc County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Mono County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Monterey County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Napa County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Nevada County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Orange County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Placer County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Plumas County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Riverside County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Benito County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Bernardino County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Diego County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Francisco County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Luis Obispo County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Mateo County, California, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Santa Barbara County, California, United States December 31, 2004 Details