Plebejus idas

Plebejus idas
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Lycaenidae
Genus: Plebejus
Species: P. idas
Binomial name
Plebejus idas
(Linnaeus, 1761)
  • Papilio idas
  • Lycaeides idas
  • Lycaeides argyrognomon

Plebejus idas, the Idas blue or northern blue,[1] is a butterfly of the Lycaenidae family. It is found in the northern regions of the Palearctic and the Nearctic realms.[2]

The species flies from June to August depending on location.

Wingspan: 17 to 28 mm.[1]

The larvae feed on Calluna and Fabaceae species.


Lycaeides argyrognomon lotis (syn. Lycaeides idas lotis, formerly Plebejus argyrognomon[3]) is a critically endangered butterfly endemic to Mendocino County, California,[4] with sightings in Sonoma and Marin counties. It has been listed as an endangered species since June 1, 1976,[3] but has not been sighted in the wild since 1994.


  1. 1 2 Northern Blue, Butterflies of Canada
  2. Jim P. Brock, Kenn Kaufman (2003) Kaufman Field Guide to Butterflies of North America. Boston: Houghton Mifflin. ISBN 0-618-15312-8
  3. 1 2 "Lotis Blue Butterfly", Xerxes society Profile
  4. "Lotis Blue Butterfly", Arcata Fish and Wildlife Office
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