I noticed this creature on a walk the other day. I later determined he was an immature Common Whitetail dragonfly. Adult males of this species have frosty-white abdomens; immature males have bodies that look similar to females.
You can tell this isn't a female by the wing markings. A female Common Whitetail has a similar wing pattern to that of a female Twelve-spotted Skimmer -- with dark spots on each wing near the body, mid-wing and tip. Visit the BugGuide to see many more photos of this species.