Gomphidae! I remember the name from back when I took aquatic entomology. I got an A, but alas that was years ago.

The exuvia looks like that of a [Dragonhunter](http://bugguide.net/node/view/17837). Comparison pic [here](http://bugguide.net/node/view/544915/bgimage). Can't tell if the adult is one (and you missed a great opportunity to flip reddit off), but it does look like a [Clubtail](http://bugguide.net/node/view/203) of some sort.

[near Lake Champlain, NY] Neat dragonfly exuvia and adult. Plus a couple bonuses.