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Erythemis simplicicollis
Males have claspers, whereas females have ovipositors.
Here is a young male's claspers:
http://bugguide.net/node/view/124692
Here is a female's ovipositor:
http://bugguide.net/node/view/55066
this one was slow and looked like he/she was getting ready to die... maybe already laid eggs? would not think it was a young male... how do you tell the difference?