I found a new Acanthomyops colony in the forest today, and I noticed variation in the workers, so I decided to take samples of both variants. I put them under the microscope, and it appears I have found a dual-species colony. I've heard that this happens somewhat often in Acanthomyops, and that it was usually not noticeable until flights. With a rough ID, I think they are Lasius claviger and Lasius subglaber.
The cf. subglaber
The cf. claviger