In the United States the crazy ant can be found from Florida to South Carolina and west to Texas. The antennae of the crazy ant have 12-segments without a club and are extremely long. All workers in a crazy ant colony are monomorphic and have only one node between the propodeum and the gaster. The scape, the basal segment of the antenna, is extraordinarily long with the apex surpassing the posterior border of the head by at least one-half the scape length. Eyes are elliptical, strongly convex, and placed close to the posterior border of the head.
Legs are extraordinarily long.
The petiole is wedge-shaped, with a broad base, and inclined forward. A small round terminal orifice surrounded by a fringe of setae, or hairs, the acedipore serves for the application of venom both in defense and predation. The stinger is lacking but the crazy may bite an intruder and curve its abdomen forward to inject a formic acid secretion onto the wound. The body has long, coarse, well scattered, suberect to erect, grayish or whitish setae. The crazy ant is extremely easy to identify on sight by observing its rapid and erratic movements.