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Augochlora pura
Sweat Bee is the common name of a large family of bees, many of which are attracted to the salts in human perspiration. Most sweat bees are small to medium-sized, 3 to 10 mm.
Nice spot Courtney, This looks like Augochlora pura - female, but I am not certain -
http://bugguide.net/node/view/79292