26 INSECTS INJURIOUS IN 1902. 
NATURAL ENEMIES OF GRASSHOPPERS. 
Like many other pests the increase of Grasshoppers is re- 
tarded by parasites, both animal and vegetable, and by predatory 
enemies which do much to lessen their numbers. The greater the 
number of hoppers the greater the number of enemies to prey 
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Fig. 22.—Blackbirds coming to the feast. Original. 
upon them. It is a notable fact that wet weather casts a gloom 
_ over these insects. As though they foresaw in it their own dan- 
ger, they are sluggish and inactive, thus giving the grain a chance 
to grow. At such times bacteria and fungus diseases carry off 
