5 i8 



THE INSECT WORLD. 



only with difficulty into the withered organ, and cannot suffocate the 

 young larvae." 



Scolytus, Hylesinus, and Bostrichus, which are connected with the 



Fig. 558. Pissodes pini. 



Fig. 559- Hylesinus piniperda 



Fig. 560. Larva of Scolytus. 



weevils, hollow out galleries between the wood and the bark of 

 different trees, when in the larva state, and devour the leaves in 

 the adult state. Fig. 559 represents the Hylesinus piniperda. The 

 Scolyti are sometimes so numerous in the forests, that the trees are 

 tattooed all over by the larvae. In 1837, they were obliged to cut 

 down, in the Bois de Vincennes, 20,000 feet of oak trees, aged 



