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Hemiargus ceraunus
Small purplish blue butterfly
Lycaenidae, Polyommatinae, Echinargus isola, male, I would say. But this is a hard one from this distance. I would be happy if someone else could take a look at it!
http://bugguide.net/node/view/161028/bgi...
http://bugguide.net/node/view/420218/bgi...
http://bugguide.net/node/view/12870/bgim...