THE INSECT WORLD. 



189 



offers a large measure of protection, since the adults will not vol- 

 untarily eat through a coat of it, and the larvae cannot do so 



Fig. 174- 



Work of the sinuate pear-borer on a Bartlett pear-tree : about one-fourth natural size. 



when first they emerge from the ^<g'g. The whitewash can be 



