Insecta. 



is probably not very acute, especially at any considerable 

 distance. The clear membrane on the first segment of the 

 abdomen is the tympanum 

 of the hearing organ. The 

 antennae are the chief or- 

 gans of touch. 



The Enemies of the Grass- 

 hopper. Probably birds 

 are the most formidable 

 enemies of the grass- 

 hopper. The grasshopper 

 usually becomes aware of 

 the approach of an enemy 

 through sight or hearing, 

 and ordinarily escapes by 

 flight or by jumping. They 

 sometimes escape by simply 

 dropping to the ground. 

 The grasshopper is largely 

 protected by his resem- 

 blance in color to that on 

 which he habitually rests, 

 some forms being usually 

 on plants, while those that 

 stay much of the time on 

 the ground are more of the 

 color of the soil. The posi- 

 tion while on plants, parallel 

 to the stem, makes them 

 less conspicuous than they 

 would be otherwise. Grass- 

 hoppers are often subject to injury by parasites, especially 

 certain red mites which are often to be found under the 



