Diatomaceous earth will kill them. If they are in the house, take the lid from a spaghetti sauce jar or sour cream container (or anything of that size), mix the DE with a little sugar and stick it under your stove and fridge. They will get into it and then take it back to their nests.
You can also sprinkle it around the perimeter of your house (outside) and that should keep them from coming in.
I purchase the food grade DE from Amazon.com. I have used it for fleas and ants. At one point, there were ants in the cat food container. I sprinkled DE over the food and it killed the ants that were in it and repelled the others.