This is probably an immature male Common Whitetail (Plathemis lydia, in the skimmer family, Libellulidae), though this one looks a bit different from a previous post, http://365project.org/rhoing/365/2012-07-31
My previous post was a “tween male”: “‘tween’ males have abdomens that are beginning to turn blue,” http://bugguide.net/node/view/603
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...