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Photo#25442
Reakirt's Blue? - Echinargus isola - male - female

Reakirt's Blue? - Echinargus isola - Male Female
Larimer County, Colorado, USA
July 22, 2005
The book says "female is darker". From the looks of it, they are a bit smaller too.

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Reakirt's Blue? - Echinargus isola - male - female Reakirt's Blue? - Echinargus isola - male - female Reakirt's Blue? - Echinargus isola - male - female

I think your tentative ID is right -
Scott (1) says the chain of large round spots on the underside of the forewing and the spots at the underside hind corner of the hindwing are distinctive. Lovely pictures!

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