566 Animal Biology 



more expensive when one considers the great amount of material needed 

 to make a single yard of it? The larvae of the army worms (certain 

 moth larvae) migrate from field to field in armylike fashion and destroy 

 large quantities of living plants, such as wheat, corn, oats, timothy, and 

 other grasses. The larvae of the codling moth bore into the blossoms 

 of the apple, eventually eating the core and seeds of the apple. Losses 



Fig. 298. — Scorpion fly of the order Mecoptera (class Insecta). Note the scorpion- 

 like tip of the abdomen; hence, the name scorpion fly. 



Larva- 



Fig. 299. — Caddice fly of the order Trichoptera. Adult and larva (in a case) 



from such attacks of the codling moth amount to more than $12,000,000 

 annually. The larvae, or caterpillars, of the cabbage butterfly destroy 

 the heart and leaves of large quantities of cabbage. The larvae of one 

 type of gossamer-winged butterflies known as the harvester are car- 

 nivorous eating woolly Aphids. They are consequently of value to fruit 

 growers. We wish the harvesters successful and prosperous lives. The 



