The only species with so much standing pilosity on the hind tibiae know from MA is this one, as the more western F. obscuripes & F. oreas do not occur there.

Although I am somewhat late to the party here (only by 6 years), I posit that this is not a queen of Formica obscuripes. Queens of F. obscuripes have very sparse erect setae on their gasters; as well, this specimen is far out of the recorded range of F. obscuripes. As I have little experience with the myrmecofauna of the North East, I defer to another ant person for the correct ID.

One of the so-called "red ants", distantly related to the true Wood-Ants (Formica rufa group). Especially common in Pine forests, where it makes rather small and irregular mounds of needles, one colony sometimes grouping several of them. The golden, fairly dense pubescence is typical for this species-group. The late date for swarming is also consistent, true Wood-Ants swarming in may or june. A dependant-founding species: a newly mated female like this one needs to parasitize a colony of the Formica fusca group in order to start a new one of its own species. Most of them are killed by trying to do so, hence the relative rarity of this and related species. Did you notice the small microhymenopteran bottom right?