Entom. Pl. toruli. [mod.L. dim. of torus in sense ‘couch, bed, seat.’] A cavity or orifice in the head of an insect, forming the socket of the antenna.
1826. Kirby & Sp., Entomol., III. xxxiv. 511. In considering the insertion of antennæ … we must advert first to the orifice (Torulus) that receives them. This is a perforation of the crust of the head; commonly … circular,… In … Rhipicera … it is a long process…: in another Coleopterous genus, Priocera, it has somewhat of the shape of a trumpet. Ibid., 512. A membranous ligament is attached by which it is affixed to the torulus.
