I seem to be having an ant problem in my house. Basically, on the upstairs level, in the stairway/landing area, near a window, medium-large winged ants keep appearing. Its usually about 1-2 per day. Its very puzzling, because there is no way they can be coming in, other than the attic access and a few recessed lightsockets. They also do not behave like normal ants. They are mostly motionless unless you try to squash them with a tissue. I'm pretty sure they're not carpenter ants, since they have a different structure, with a long abdomen. What should I do? Advice?