Moved from Ponerinae.

From Massachusetts, almost certainly this species. In warmer climate areas, the superfically very similar genus Hypoponera also has several North American species.

is just not strong enough to be absolutely conclusive, but I too would lean for "something different" in the same tribe. Subfamily Ponerinae is granted at any rate.
These two shots are very interesting fot at least two other reasons:
First, they show that even so small colonies can have two functional queens (the two biggest individuals, with well developped ocelli, are dealated females).
Second, the size of workers is very variable, the biggest one being hardly smaller than the queens.