In the cricket,Gryllus bimaculatus, compensatory head movements are elicited by cereal and antennal receptors when the animals are rotated around their longitudinal axis. The cereal afferences originate in the club-shaped sensilla, whereas the antennal ones probably arise in receptors measuring displacements of the flagellum at the joint between scapus and pedicellus. The clubshaped cereal sensilla are true gravity receptors different from the proprioceptive gravity receptor systems characteristic of most insects.