6o 



ANTS. 



cxuvia away from the surface of the body. In section each hair is 

 to be a hollow chitinous tube, closed at its apex and open at its 

 r-e, which is bulbously swollen and fits into a ring-shaped thickening 



E 



n 



G 



FIG. 31. Trichodeal and campaniform sensillae of ants. (Janet.) A. Trichodeal 

 sensillse from proximal border of fore coxa of female Lasiits niger, X 1,000 ; B. single 

 sensilla from the group represented in A, X 2,000; C, longitudinal section through 

 tip of middle coxa, trochanter and base of femur of Myrmica nibra worker. X 100; 

 D , cross-section of tip of hind tibia of M. ntbra. X 200 : E, F and G, sections of cam- 

 paniform' sensillae from tip of mandibles of M. ritbra ; H, campaniform sensilla? near 

 articulation of wing of female Camponotits herculeanus, X 500 ; /, chitinous hair ; c. 

 chitinous integument ; h, hypodermis : n, nerve-termination ; u. bell, or umbrella, in 

 the center of which the nerve terminates; x, groups of campaniform sense-organs; 

 d, fossa or pit in the chitinous integument ; p, pore in same. 



of the chitinous integument (Fig. 31, A, B, Fig. 32, b). This tube is 

 secreted by one or more large hypodermal cells, and a delicate nerve 

 fiber extends up into its base. When the tip of the hair touches an 



