Attributes of Euphilotes ancilla
Rocky Mountain Dotted-Blue
Euphilotes ancilla (Barnes & McDunnough, 1918)
Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Upperside of male is deep blue with wide black borders; hindwing orange band usually absent. Female brown with variably expressed marginal orange patch on the hindwing. Underside of both sexes is light blue-gray with black spots. Underside of forewing often suffused with smoky gray.
Wing Span: 5/8 - 1 inch (1.6 - 2.5 cm).
Life History: Dotted Blues usually stay near their host plants. Males patrol around the host plants all day to find females. Eggs are laid singly on flowers or buds; caterpillars eat flowers and fruits and are tended by ants. Chrysalids hibernate in leaf litter.
Flight: One flight; late April to early August depending on location and elevation.
Caterpillar Hosts: Various Eriogonum species, especially Sulphur-flower.
Adult Food: Flower nectar, especially from Eriogonum.
Habitat: Sun-exposed rocky slopes and flats with host plant colonies.
Range: Washington south to California and southern Alberta and Saskatchewan south through rockies and high plains to Wyoming, Colorado, Utah, and northwestern New Mexico.
Conservation: Not required for the species, but rare subspecies in Nevada require survey and assessment of threats from alien weeds.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Subspecies shieldsi Austin and purpura Austin of Nevada are of high conservation concern because of their local nature and possible threat from invasive alien weeds such as cheatgrass.
Management Needs: Conserve habitats for rare subspecies and maintain host plant populations.
Taxonomy Notes:
Images of Euphilotes ancilla
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The map below displays all verified sighting records in the BAMONA database for this species. Each record is indicated with a yellow dot. The orange dots on the map provide access to information about the 400 most recently verified sightings of this species. In some instances, there are several records at the same location. Use the table view to access these records.
Instructions: Click on the map and move your mouse to pan.
Zoom by using the plus [+] and minus [-] on the left side of the map.
To change which map layers are displayed, click on the plus sign [+] on the right side of the map.
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.
| Observation Date | Submitter | Region |
Verified Date |
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|---|---|---|---|---|---|
| January 01, 1950 | legacy.reporter | Siskiyou 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 | Mono County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Sierra 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 | Nevada County, California, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | La Plata County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Weld County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Larimer County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Boulder County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Jefferson County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Jackson County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Delta County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Moffat County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Rio Blanco County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Garfield County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Mesa County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Montrose County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | San Miguel County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Dolores County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Montezuma County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Gunnison County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Pitkin County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Chaffee County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Park County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Summit County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Eagle County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Grand County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Jackson County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Routt County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Gilpin County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Clear Creek County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Douglas County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Elbert County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Ouray County, Colorado, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Nez Perce County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Ada County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Boise County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Elmore County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Owyhee County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Twin Falls County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Cassia County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Madison County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Bannock County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Caribou County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Franklin County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Bear Lake County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Washington County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Fremont County, Idaho, United States | December 31, 2004 | Details | |
| January 01, 1950 | legacy.reporter | Teton County, Idaho, United States | December 31, 2004 | Details |
