140 CLASS-BOOK OF ZOOLOGY. 



570. What do you know of the Field-cricket ? 



571. Where is the House-cricket found, what is its food, and how can 

 it be destroyed ? 



572. What do you know of the Mole-cricket? 



573. What do you know of the size and color of Grasshoppers ? What 

 injury do they do, and where are they found ? 



574. Which is the most injurious Grasshopper? Describe it. 



575. How does it make its appearance ? 



576. What has been the consequence of the devastation of the Wan- 

 dering Grasshopper ? 



577. What is the external structure of the Seventeen-years Locust? 



578. Where and how is the Seventeen-years Locust found, and what 

 can you say of its name ? 



579. Why should not the appearance of the Seventeen-years Locust 

 excite anxiety and alarm? 



580. What use can be made of the Seventeen-years Locust, and what 

 did the ancients think of it ? 



SECTION XXXV. 



3d Order — Butterflies : (Lepidoptera.) 



§ 581. Butterflies are distinguished by having expanded 

 wings, covered with colored scales, and by their hairy 

 bodies. 



§ 582. The Caterpillars of Butterflies have jaws ; a 

 body extended in twelve segments, with nine airholes 

 (spiracles) on each side for breathing ; three pairs of 

 hook-shaped claws on the chest, (thorax ;) and commonly 

 five pairs of round fleshy legs on the hind-body, (abdo- 

 men.) 



§ 583. The Caterpillar changes into a Cocoon, which 

 is generally incapable of motion, and the cocoon, after a 

 certain time, changes into a Butterfly, which has gener- 

 ally long antennae, three pairs of feet, and a spirally-rolled 

 tongue, for sucking, in the place of jaws. 



§ 584. The Day-butterfly is so called from its flying 

 only in the daytime. When sitting, it elevates its four 

 expanded wings with the upper surfaces, which in many 

 instances differ materially in their color from the under 

 ones. 



