202 INSECTS 
thinner, and when not in use are folded underneath the others 
like a fan. The mouth is made for biting. These creatures 
are great eaters all their lives, the grasshoppers being very 
destructive to vegetation. Certain locusts or short-horned 
grasshoppers are a much-dreaded insect plague in various 
parts of the world, and in regions that are subject to their 
ravages it is sometimes almost impossible to carry on agri- 
a. : b. C 
a, Katypw; b, CocKRoacH; c, CRICKET 
culture, as they may devour every blade of vegetation within 
their reach. 
Grasshoppers lay their eggs in masses of 20 to 100 in the 
ground where they remain over the winter and hatch in the 
spring. The young resemble the parent, but are smaller 
and wingless. 
Bugs, Lice, and Plant Lice suck the blood of animals or 
the sap of plants, and most of them are quite harmful to 
their victims. Some of them have four wings and others 
have none at all. The most important group belonging to 
