When I lived in Luuziana, fite ants were one of the pests we had to deal with. (One neighbor was another pest, but the following didn't work on them.)
Pour a circle of gasoline around the anthil to discourage escapees. Then douse the anthill itself. Stir it in a bit, and add another cupfull. Cap up the can, and remove it from the premises while the gas soaks in. Return, and drop a lighted match. Test skill with chopsticks, trying to pick up the little devils.
Pour a circle of gasoline around the anthil to discourage escapees. Then douse the anthill itself. Stir it in a bit, and add another cupfull. Cap up the can, and remove it from the premises while the gas soaks in. Return, and drop a lighted match. Test skill with chopsticks, trying to pick up the little devils.