COLLECTION AND PRESERVATION OF INSECTS 39 



The immature stages are wormlike and live in water. Most of them 

 build cases about their bodies. The adults are common around streams 

 (See fig. 36.) 



Figube 36. — Trichoptera. Phryganea vestita (Walk.), a caddisfly. Actual length 



about 20 mm. 



LEPIDOPTERA 



Lepidoptera (butterflies, moths) are usually winged, the winged 

 members having two pairs of wings covered with overlapping scales. 

 (See fig. 37.) The mouth parts of the adults are formed for sucking. 

 The immature stages are wormlike and are known as caterpillars, 

 cutworms, or hornworms. Their mouth parts are formed for chew- 

 ing. This is one of the best known orders of insects and contains 

 some of our most important pests, such as the codling moth, the army- 

 worm, clothes moths, cabbage worms, and many other common forms. 

 Most of the species feed on leaves of plants in the immature stages, 

 but others bore in plant stems and some are leaf miners. 



