Crazy Ants (Paratrechina longicornis) have a one-segmented petiole, lack a sting, have a circular fringe of hairs at the tip of the abdomen, with the long first segment of the antenna nearly twice the length of the head. The thorax is unevenly rounded when viewed in profile and the legs are thin and very long relative to the rest of the body. Workers are monomorphic, about 1/10 in. long and dark brown to black. The Crazy ant is so-called because of their habit of running around crazily with no apparent purpose.