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Libellula luctuosa
I would also recommend putting this spotting and any other Dragonfly spottings you have in this mission:... http://www.projectnoah.org/missions/6524...
Here's another good mission for any of your Arthropod spottings in New England:... http://www.projectnoah.org/missions/1408...
And if you have any Moth spottings this is a good mission to put them in:...http://www.projectnoah.org/missions/14030082
Looks like Neurothemis tullia (Pied Paddy Skipper dragonfly). But I am not sure of its distribution in the USA.