Insect Identification: ID a 3-4cm Long Insect

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We were walking down a Brooklyn sidewalk the other day under several trees when we spotted this insect lying motionless (except when the wind blew, it moved its legs a little to rotate itself). We didn't get too close, as it looked like it could give a bad sting. It has two pairs of long veined wings, like a dragonfly's, and is about 3-4 cm long, so it is much larger than an ant, even though its' body appears similar. What is it?

http://img55.imageshack.us/i/oddinsect.png/
http://img269.imageshack.us/i/oddinsectfront.png/
 
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Curious looking bug...it looks like the abdomen is split. I Googled using winged insect bifurcated abdomen, and also winged insect lobed abdomen. Didn't see anything like it.

But I'm not an entomologist...surely someone here will know it, though.
 
Thanks for the effort. If only there was a Google for image matching! :D