INSECTS 



223 



Toads as Insect Destroyers. — The common toad, found 

 in the garden, Hves almost entirely upon insects. He eats 

 enormous numbers, most of which are of the harmful kinds. 



Fig. 140. — Digger-wasp carrying a cicada to its home. 



Fig. 141, — Sphinx caterpillar covered with cocoons of parasites. (From Smith's 

 "Insect Friends and Enemies.") 



Toads have no harmful habits. They should be protected 

 because of the good they do. A single full-grown toad will 

 do several dollars' worth of good in a garden each season. 



REVIEW. 



1. Describe the structure of insects, as to body, wings, legs, and 

 parts on the head. 



2. Tell of the two kinds of mouth parts of insects. 



3. Why cannot insects that have sucking mouth parts be poisoned ? 

 How are they usually controlled ? 



4. Tell what you can about the skeleton of an insect. 



5. Tell how insects grow. 



6. Tell what is meant by the terms complete change and incom- 

 plete change in the development of insects. 



7. Name the four stages in the life of insects having complete 

 change. 



8. Tell what you can about the larval stage. 



9. Tell what you can about the pupal stage. 



10. To what forms of larvae do these terms apply: caterpillar, grub, 

 maggot, wriggler, nymph? 



