16 THE PHYSIOLOGY OF INSECT SENSES 



common than Type I and are most abundant in soft-skinned larvae. 

 Their branching distal processes may form an elaborate subepidermal 

 net, as in the larva of Melolontha vulgaris (Fig. 7) (Zawarzin, 1912 b). 

 They also occur in the walls, muscles, and connective tissue of the 



B 



Fig. 9, Types of campaniform sensilla. A. From the haltere of Calliphora 

 erythrocephala. B. From the cercus of Gryllus domes ticiis. C. From the 

 cercus of Blatta orientalis. (Redrawn from Hsii, 1938.) 



alimentary tract of some insects {Periplaneta americana [Zawarzin, 

 1912 a] and larvae of scarabaeid beetles [Orlov, 1924] [Fig. 8]). 

 Richard (1951) has described them in the labium, labrum, and 

 hypopharynx of termites (Fig. 9). Until Finlayson and Lowenstein 

 (1955, 1958) studied some Type II receptors electrophysiologically, 



