This individual could be a Slender Spreadwing damselfly (Lestes rectangularis), although I admit ID-ing damselflies is not my forte! Slender Spreadwings are relatively abundandant in Northern Virginia now -- your damselfly looks very similar to ones I photographed recently that were confirmed by an expert to be Slender Spreadwings. http://bugguide.net/node/view/6459
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