Coenagrionidae, Narrow-winged Damselflies, I would say. After checking tons of damselflies my closest candidate would be Enallagma geminatum. But since I actually have no IDeas about Odonata, please, verify!!!
http://bugguide.net/node/view/1085965/bgimage
Best match:
http://bugguide.net/node/view/190128/bgimage
Please, check very carefully EVERY marking!
Good luck! You are free to try also the other ones ;-)...
http://bugguide.net/node/view/380/bgpage?from=5
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