The first place to start is cleaning up every single crumb those ants could possibly find to munch. They seem to always especially love cat food (I never had such problems with dogs and dog food, but moved into one apt where there was just a few morsels of cat food that had gotten under the stove and were obviously missed by the cleaning crew, and there was a whole line of ants marching in for it). Well, obviously nobody had cleaned under the stove in a very long time, probably since it had been installed...eeeeeewwwwww! Anyway, I got under there and cleaned out all the crumbs and goo, and I don't know what, did the same for every other nook and cranny, kept all my food in the refrigerator or zipper bags or tight sealing containers, put down ant traps for a week, and they all went away and never came back. You'll probably have to put the cat food down for limited times during the day and keep it sealed up the rest of the day.
Also, if you can find where they are coming in from, seal them out...common places are under sinks or other places where plumbing comes in through walls or from outside. A silicone caulking will work well to fill in gaps.
They also will create an ant trail of chemical markers to lead their friends to the food source. The scrubbing will help with that too...use a good detergent to clean the floors along the trail the ants are following to get rid of their road signs.
And if that doesn't work, how about:
Anne, Bonnie, Clara, Dana, Eve, Fiona, Gloria, Heide, Ingrid, Jeanette, Kim, Lynne, Monica, Nancy, Olivia, Patty, Rosie, Sarah, Tina, Ursula, Vanna, Wilma, Yvette.
That covers 23 of them (couldn't think of names starting with Q, X, or Z). Remember, the ants you're seeing are all workers, and that makes them female, so you have to come up with 78,216 girl names :-)
Or leave an antenna in a box at the entrance of their ant hill 
