Common NameWestern Tailed BlueSeasonalityFlies in a single yearly brood from May to August, most common in mid June to early July.IdentificationThe pale, chalky undersides with tailed hindwings make this species very distinctive.
Scientific NameCupido amyntulaCommon Name
Western Tailed Blue
Habitat
Widespread in many habitat types; fond of meadows, clearings roadsides and pastures.
Seasonality
Flies in a single yearly brood from May to August, most common in mid June to early July.
Identification
The pale, chalky undersides with tailed hindwings make this species very distinctive.
Life History
Unknown for Alberta. Mature larvae are variable in colour, and range from yellow to green with a dark green or reddish dorsal stripe, pink lateral stripe, and red or pink oblique bands (Layberry et al. 1998). Larvae…
Unknown for Alberta. Mature larvae are variable in colour, and range from yellow to green with a dark green or reddish dorsal stripe, pink lateral stripe, and red or pink oblique bands (Layberry et al. 1998). Larvae overwinter and are often tended by ants (Layberry et al. 1998). Guppy & Shepard (2001) provide a picture of the pupa, which is cream-coloured with a row of black dorsal and lateral spots, and a covering of fine hairs.
Conservation
Not of concern.
Diet Info
The larvae are legume-feeders, although no hosts have been recorded for Alberta; elsewhere, they feed on pea-vine (Lathyrus sp.) (Layberry et al. 1998) and vetch (Vicia americana) (Guppy & Shepard 2001).
Range
Although this species is widespread throughout western North America from Alaska to northern Mexico (Opler 1999), it is not strictly a western species as the name implies: it also occurs east to north-central Ontario,…
Although this species is widespread throughout western North America from Alaska to northern Mexico (Opler 1999), it is not strictly a western species as the name implies: it also occurs east to north-central Ontario, with an isolated population on the Gaspé Peninsula of Quebec (Layberry et al. 1998).
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Citation
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Page Citation for Cupido amyntula
Page Citation
"Species Details - Cupido amyntula, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-2616. Accessed 06 Feb. 2025.
References
AuthorOpler, Paul A.
TitleA field guide to western butterflies.
Publication Date1999
Pages540
AuthorBird, C. D., G.J. Hilchie, N.G. Kondla, E.M. Pike and F. A. H. Sperling
TitleAlberta Butterflies
Publication Date1995
Pages349
AuthorGuppy, Crispin S. and Jon H. Shepard
TitleButterflies of British Columbia.
Publication Date2001
Pages414
AuthorLayberry, Ross A.; Hall, Peter W. and J. Donald LaFontaine
TitleThe Butterflies of Canada
Publication Date1998
Pages280
Specimen Information
There are 33 specimens of this Species.
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33 results plotted on map in 14 markers. Note: Only records with latitude and longitude coordinates are plotted on map.