I wanted to take a moment and pass along an excellent site that I use extensively in trying to identify insects of all types - BugGuide.net.
BugGuide.net is free to use, and allows anyone to submit photos of insects - unidentified or identified. So many experts use the site that it isn't uncommon to identify a mystery bug within an hour or two.
In fact, BugGuide encourages everyone to submit identifiable photos to help build their collection. You'd be surprised about how little is known about many species of insects, and getting confirmed sitings in new locations, at previously unheard of dates, or performing previously unknown behaviors adds to the collective knowledge.
So check out BugGuide.net and submit a few photos!