The ants, however, were much more persistent.
I sprayed poison, I swept, I mopped, I crushed dozens with my fingers and toes. I eliminated every food source I could think of and still the kept crawling all over my floors. Finally, I killed them off this weekend by mixing Boric acid with finely crushed crackers and spreading it in little piles on the floor (thanks Mark!) The ants loved it - they took every last piece of poisoned cracker back to their nest and haven't returned since!