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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Euphilotes ancilla - euphilotes_ancilla_caterpillar3b_raisingbutterflies.jpg

Euphilotes ancilla - euphilotes_ancilla_caterpillar3b_raisingbutterflies.jpg
Euphilotes ancilla - euphilotes_ancilla_caterpillar3a_raisingbutterflies.jpg

Euphilotes ancilla - euphilotes_ancilla_caterpillar3a_raisingbutterflies.jpg

Euphilotes ancilla - euphilotes_ancilla_egg_raisingbutterflies.jpg

Euphilotes ancilla - euphilotes_ancilla_egg_raisingbutterflies.jpg
Euphilotes ancilla - 3820_60.jpg

Euphilotes ancilla - 3820_60.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
June 28, 2014 sagebird52 Carbon County, Wyoming, United States June 30, 2014 Details
May 16, 2004 cyric Boulder County, Colorado, United States June 22, 2014 Details
June 12, 2012 coreyk Clark County, Nevada, United States June 14, 2014 Details
July 02, 2013 sagebird52 Albany County, Wyoming, United States August 04, 2013 Details
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
June 23, 2012 Glenn Marangelo Granite County, Montana, United States July 25, 2012 Details
July 16, 2009 sararobinson Yellowstone National Park County, Wyoming, United States March 08, 2012 Details
August 21, 2011 J_Martineau Big Horn County, Wyoming, United States December 17, 2011 Details
June 22, 2010 RaisingButterflies.org Davis County, Utah, United States November 28, 2011 Details
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