I found a number of workers like this having an energetic but relatively nonviolent encounter with a Camponotus pennsylvanicus colony in Madison, ME. This is the first wild Camponotus species I have seen which has a red head, and along a path which I travel often. I assumed this is Camponotus nearcticus, but I am having a couple of problems with this ID. First is the size; the Mississippi Entomological Museum lists C. nearcticus workers as falling into a range of 3.5 to 7.5 mm, while this wounded worker in particular is 10mm long, with some of her sisters being larger. I don't see a clypeal notch either, although I'm not used to looking for it on Camponotus. There are many long hairs on the thorax of this major, which is also a feature I am having trouble finding on C. nearcticus specimens. There are no hairs on the gena.
Nearby, I found a relatively large 5mm Ponera dealate (go figure.)