164 Insect Ravages in Woodlands. 



658. As a general rule, these bark-boring insects are most liable 

 to attack fallen timber, and espeoially that which has been over- 

 thrown by storms in the season of active vegetation, or trees that 

 have had their vitality weakened from being scorched by fire. 



84. Hylesinus pini- 85. Burrows of the flj/iesiniMpim'penfa under the Bark of the 

 perda. (greatly en- Scotch Pino, with the Insects of natural size, 



larged). 



659. The damage done to logs cut for lumber may be lessened by 



taking off the bark as 

 soon as the trees are 

 felled. The above en- 

 gravings represent an en- 

 larged view of one of 

 these bark-insects, with 

 the form of its burrows, 

 and the insect of its nat- 

 ural size. 



660. With respect to 

 wood-boring insects, the 

 amount of injury done to 

 the timber depends upon 



the uses to which it is to 



, Punctures mafle In the TTenrt- wood of Oak, by a , ,. , -rj> ,• t ^ .^ 



■ Lymexyelon; natural size. be applied. It shght, it 



