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Project Noah Nature School
Since the eyes are touching, it can't be a petatail. Any darner in the NE in spring is an Anax (Green Darner), Basiaeschna janata (Springtime Darner), Rhionaeschna mutata (Spatterdock Darner), or one of two Gomphaeschna species. This certainly looks like Gomphaeschna to me. Probably Gomphaeschna furcillata (which is more common in the NE), but it may be Gomphaeschna antilope (which would be a great find in MA!). Perhaps someone with more Gomphaeschna experience can discern the species from the photos.
