Are these myrmica the only semi-claustral in the area?
I'm sure they aren't the only ones. According to www.antmaps.org there are quite a few: stenamma, stigmatomma, strumigenys, and other myrmecia species. I could be missing a few. These species tend to be very hard to come across, so finding one of these queens is very rare. I'm happy I just found her by accident, and a colony of these guys would be really interesting to keep!
Tapinoma Sessile (founding) x3
Tapinoma Sessile x1
Camponotus Pennsyvanicus x2
Prenolepis Imparis (founding) x2
Myrmecina Americana (founding) x1
Myrmecina Americana x1