Examples of Pupils' Work 161 



killed, then he is eaten by the victor. Crickets always 

 live alone. 



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Head and Mouth-parts of Grasshopper. 



2. The body of the grasshopper is made of chitin, pro- 

 tecting the delicate parts within. This integument is at 

 intervals segmented or jointed, the segments are more or less 

 like rings, which in turn are subdivided into pieces. The 

 body consists of seventeen of these segments four in the 

 head, three in the thorax, and ten in the hind body or 

 abdomen. The organs of sense are in the head. 



3. The head also carries the compound eyes, which 

 are composed of a large number of hexagonal cornea, or 

 facets, often many thousands. They are so round that 

 the grasshopper can see in all directions at once. That is 

 why it is so hard to catch one even when you come softly up 

 behind him. The ocelli or simple eyes are three in num- 

 ber, two posterior and one anterior ocellus. Insects see 

 objects best when moving. 



4. The antennae or feelers are inserted in front of the 

 eyes, and between them is the anterior ocellus, or simple 

 eye. All are tubular and jointed. They are supposed to 

 be organs of touch and also sensitive to sound. 



There are long-haired and short-horned grasshoppers. 

 The Katydid, which is the green giasshopper, has antennae 



