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.
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The fifty most recently verified sightings are below. See more recently verified sightings of all species.
| Observation Date | Submitter | Region |
Verified Date |
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|---|---|---|---|---|---|
| June 05, 1979 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| June 06, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| June 11, 1979 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 20, 1977 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 02, 1936 | legacy.reporter (unknown) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 25, 1977 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 20, 1978 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 28, 1977 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| August 19, 1977 | legacy.reporter (George T. Austin) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 16, 1972 | legacy.reporter (J. F. Lesser) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| June 26, 1959 | legacy.reporter (Oakley Shields) | Clark County, Nevada, United States | December 01, 2012 | Details | |
| July 14, 1966 | legacy.reporter (Oakley Shields) | Clark County, Nevada, United States | December 01, 2012 | Details | |
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June 23, 2012 | Glenn Marangelo | Granite County, Montana, United States | July 25, 2012 | Details |
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July 16, 2009 | sararobinson | Yellowstone National Park County, Wyoming, United States | March 08, 2012 | Details |
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August 21, 2011 | J_Martineau | Big Horn County, Wyoming, United States | December 17, 2011 | Details |
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June 22, 2010 | RaisingButterflies.org | Davis County, Utah, United States | November 28, 2011 | Details |
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July 12, 2008 | RaisingButterflies.org | Davis County, Utah, United States | November 28, 2011 | Details |
| July 04, 1997 | Ken Davenport (Ken Davenport) | Clark County, Nevada, United States | May 01, 2011 | Details | |
| July 05, 1970 | legacy.reporter (C. Callaghan) | Humboldt County, Nevada, United States | January 01, 2011 | Details | |
| July 19, 2010 | legacy.reporter (Paul Opler and EviBuckner-Opler ) | Teton County, Wyoming, United States | December 31, 2010 | Details | |
| July 19, 2010 | legacy.reporter (Paul Opler and EviBuckner-Opler ) | Teton County, Wyoming, United States | December 31, 2010 | Details | |
| July 19, 2010 | legacy.reporter (Paul Opler and EviBuckner-Opler ) | Teton County, Wyoming, United States | December 31, 2010 | Details | |
| July 20, 2010 | legacy.reporter (Paul Opler and EviBuckner-Opler ) | Teton County, Wyoming, United States | December 31, 2010 | Details | |
| May 22, 2010 | legacy.reporter (Jan Chu and Christian Nunes) | Boulder County, Colorado, United States | August 02, 2010 | Details | |
| June 21, 1985 | legacy.reporter (Gordon Pratt) | Nevada County, California, United States | January 07, 2010 | Details | |
| July 15, 1984 | legacy.reporter (Gordon Pratt) | Nevada County, California, United States | January 07, 2010 | Details | |
| July 01, 1979 | legacy.reporter (J. Emmel, G. Pratt) | Inyo County, California, United States | January 07, 2010 | Details | |
| July 12, 2009 | Ken Davenport (Ken Davenport) | Mono County, California, United States | October 19, 2009 | Details | |
| July 10, 2009 | Ken Davenport (Ken Davenport) | Mono County, California, United States | October 19, 2009 | Details | |
| July 13, 1986 | Ken Davenport (Ken Davenport) | Amador County, California, United States | October 19, 2009 | Details | |
| June 27, 1999 | Ken Davenport (Ken Davenport) | Mono County, California, United States | October 19, 2009 | Details | |
| July 02, 1995 | legacy.reporter (John G. Pasko) | Mono County, California, United States | October 19, 2009 | Details | |
| July 16, 1984 | legacy.reporter (Gordon Pratt) | Mono County, California, United States | October 19, 2009 | Details | |
| July 19, 2008 | legacy.reporter (Paul Opler and Evi Buckner-Opler) | Teton County, Wyoming, United States | September 29, 2008 | Details | |
| June 26, 2004 | legacy.reporter (Will Kerling) | Park County, Montana, United States | January 29, 2008 | Details | |
| June 30, 2004 | stevekohler (Steve Kohler) | Broadwater County, Montana, United States | January 29, 2008 | Details | |
| June 23, 2005 | stevekohler (Steve Kohler) | Jefferson County, Montana, United States | January 29, 2008 | Details | |
| June 13, 2007 | stevekohler (Steve Kohler) | Powder River County, Montana, United States | January 29, 2008 | Details | |
| June 14, 2007 | stevekohler (Steve Kohler) | Carter County, Montana, United States | January 29, 2008 | Details | |
| June 19, 1994 | charleseharp (Chuck Harp) | Liberty County, Montana, United States | January 29, 2008 | Details | |
| 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 |
