Attributes of Plebejus idas

Northern Blue
Plebejus idas (Linnaeus, 1761)

Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Geographically variable. Upperside of male iridescent blue, female brown with orange submarginal spots. Below, hindwing has a thin black line along outer margin which is broken into small dots at vein ends. Can be positively identified only by dissection of male genitalia and by locality.
Wing Span: 7/8 - 1 1/2 inches (2.2 - 3.8 cm).
Life History: Males patrol near host plants for females. Eggs are laid singly on stems of host plant or in debris beneath it. Second-stage caterpillars overwinter.
Flight: One brood from July-August.
Caterpillar Hosts: Plants of the heath family (Ericaceae) in the east; legumes of the pea family (Fabaceae) in the west.
Adult Food: Nectar from flowers including yarrow; dogbane; orange hawkweed; and white, alsike, and hop clover.
Habitat: Openings in mixed evergreen forests, bogs, wet meadows, seeps.
Range: Holarctic. Nova Scotia west through the Great Lakes area and southern Canada; north to Alaska; south to central California, southern Idaho, and southwest Colorado.
Conservation: Subspecies lotis is probably naturally rare with low population densities; it is found currently in only 1 out of 7 of its historic sites. Successional changes in vegetation due to human disturbance choked out the host plant Lotus formosissimus. Subspecies lotis has The Nature Conservancy rank of T1 - Critically imperiled because of extreme rarity (5 or fewer occurrences, or very few remaining individuals), or because of some factor of its biology making it especially vulnerable to extinction. (Critically endangered throughout its range). The species as a whole has The Nature Conservancy Global Rank of G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
NCGR:
Management Needs: The U. S. Fish and Wildlife Service recovery plan for the Lotis Blue cites the need for basic biological and ecological information about this butterfly. Three steps to recovery are listed: 1) protect remaining habitat and butterflies at the only known population site, 2) establish 3 new populations at different sites, and 3) determine the extent of the population and the size of secure habitats needed.
Taxonomy Notes:

Images of Plebejus idas

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Plebejus idas - plebejus_idas_kondla2.jpg

Plebejus idas - plebejus_idas_kondla2.jpg
Plebejus idas - plebejus_idas_kondla1.jpg

Plebejus idas - plebejus_idas_kondla1.jpg
Plebejus idas - 52006.jpg

Plebejus idas - 52006.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
August 02, 2014 Sue Orlowski Spokane County, Washington, United States August 10, 2014 Details
August 06, 2013 janazak Yukon Territory, Canada July 28, 2014 Details
July 23, 2013 David Trently Newfoundland and Labrador, Canada July 28, 2013 Details
July 27, 2012 plex1ppus Lincoln County, Montana, United States October 12, 2012 Details
July 22, 2012 Jdammarell Ravalli County, Montana, United States July 25, 2012 Details
July 19, 2012 plex1ppus Spokane County, Washington, United States July 23, 2012 Details
July 08, 2012 Jdammarell Spokane County, Washington, United States July 09, 2012 Details
August 26, 2011 Jdammarell Spokane County, Washington, United States September 03, 2011 Details
July 27, 2011 elenajean Flathead County, Montana, United States August 31, 2011 Details
June 14, 1998 Ranger Steve Mueller (Steven J. Mueller) Alger County, Michigan, United States May 01, 2011 Details
June 18, 2000 legacy.reporter (Mueller, Steven) Alger County, Michigan, United States May 01, 2011 Details
July 25, 2009 plex1ppus (plex1ppus) Spokane County, Washington, United States March 08, 2011 Details
June 26, 2006 Norbert Kondla British Columbia, Canada February 18, 2011 Details
August 09, 2008 Peggy Hamlen Fremont County, Idaho, United States February 10, 2011 Details
August 09, 2008 Peggy Hamlen Fremont County, Idaho, United States February 10, 2011 Details
August 09, 2008 Peggy Hamlen Fremont County, Idaho, United States February 10, 2011 Details
August 21, 2010 J_Martineau Sheridan County, Wyoming, United States January 23, 2011 Details
July 16, 2010 legacy.reporter (Paul Opler and EviBuckner-Opler ) Madison County, Montana, 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
July 20, 2010 legacy.reporter (Paul Opler and EviBuckner-Opler ) Teton County, Wyoming, United States December 31, 2010 Details
August 19, 2009 gerryq (Gerry Queener) Shoshone County, Idaho, United States January 08, 2010 Details
August 19, 2009 gerryq (Gerry Queener) Shoshone County, Idaho, United States January 08, 2010 Details
July 19, 2008 legacy.reporter (Paul Opler and Evi Buckner-Opler) Teton County, Wyoming, United States September 29, 2008 Details
January 01, 1950 legacy.reporter Okanogan County, Washington, United States September 29, 2008 Details
August 15, 1996 legacy.reporter (Byron Weber) Liberty County, Montana, United States January 29, 2008 Details
June 28, 1995 legacy.reporter (F/P) Northwest Arctic Borough, Alaska, United States January 23, 2008 Details
June 21, 1995 legacy.reporter (F/P) Northwest Arctic Borough, Alaska, United States January 23, 2008 Details
June 24, 2004 legacy.reporter (KWP) Fairbanks North Star Borough, Alaska, United States January 23, 2008 Details
January 01, 1950 legacy.reporter Alaska, 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 Gunnison 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 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 Ouray County, Colorado, United States December 31, 2004 Details
January 01, 1950 legacy.reporter San Juan County, Colorado, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Hinsdale County, Colorado, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Boundary County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Bonner County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Kootenai County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Shoshone County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Idaho County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Adams County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Lemhi 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 Custer County, Idaho, United States December 31, 2004 Details
January 01, 1950 legacy.reporter Clark County, Idaho, United States December 31, 2004 Details