Not to overdo the butterflies and give the dragonflies their due. This is a mature male Common Whitetail.
From BugGuide, http://bugguide.net/node/view/603#id »
• "Male and female Common Whitetails have different wing patterns.
• "Immature males have the same body pattern as females but the same wing pattern as mature males.
• "'Tween' males have abdomens that are beginning to turn blue, but the adolescent body pattern still shows through the blue.
• "Mature males have a short, stout abdomen that is completely chalky blue-white covering the adolescent pattern."
Compare to a female, http://365project.org/rhoing/365/2016-05-29
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