I found these queens on my trip to New Hampshire. I am convinced that they are in the Sanguinea group. They are about 8mm in size, smaller than I would have expected. I assume this is because they are social parasites. They were both found lurking around a large Formica subsericea nest in an area with a large number of pine trees. I have small colony of F. subsericea, and when I introduce one of the unidentified queens, she immediately attacked the F. subsericea queen. (I removed her, not wanting to kill my only colony.) They don't appear to be like the F. aserva I find near my home. Any help would be appreciated.