How can you tell what kind of ants they are? The ones I have been battling for months are about the size of fire ants but the bodies are partially dark brown and partially red. I find them roaming around individually, randomly, in all parts of the house. I had Terro baits set up on a windowsill where there were more of them. They fed at the stations for weeks. I cleaned up the dead ones (I've cleaned up piles of bodies from the carpet under that windowsill three times.) and the detritus last weekend, including a dirt trail along the bottom of the window. I hadn't seen any actively feeding for a while, but now they seem to be back. I've sprayed outside, along the door sills, and along the window bottoms, inside and out. I've also used Orthene in several areas as well. I am getting to the point at which I may call an exterminator.