ORDER HEMIPTERA 



97 



been interpreted as that of a mating call, hut no auditors- 

 organ has been described. The females deposit eggs in 

 twigs of trees, punctiu-ing the trees with little furrows, which 

 result in splitting the bark, and the twigs often die. The 



-Tihicen septendccem: twigs broken from egg deposition 

 (Photo from Ohio Exp. Sta.) 



eggs hatch five or six weeks after their deposition. The 

 larvse drop from the twigs and pass into the ground and from 

 that time on for almost the next seventeen years are out of 

 sight and are growing gradually, moulting occasionally, 

 7 



