164 



Insect Ravages in Woodlands. 



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

 to attack fallen timber, and especially 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. 



BBH 



84. Hylesinu* pint- 85. Burrows of the Hj/lftsimispirtiperfla under the Bark of the 

 perda (greatly en- Scotch Pine, 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 

 $\\m the form of it.s burrows, 



' m\ I J'A'I r 



F r*' ,1: I and the insect of its nat- 



irJIH , Hill, 'i ln*ilil 



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 



86. Punctures made in the Heart-wood of Oak, by a . 



Lymexyelon, natural size. DC applied. It Slight, it 



