26 A GUIDE FOR THE STUDY OF ANIMALS 



rest, feeding, jumping and crawling, approaching an object 

 or another grasshopper, etc. 



lo. How many compound eyes has the grasshopper ? 

 How many simple eyes ? Where are they located ? 



Feeding, ii. Do grasshoppers eat and drink while in 

 captivity ? Put a fresh bunch of grass which has been 

 sprinkled with water in a vivarium with grasshoppers that 

 have had no food or drink for twenty-four hours and watch 

 results. 



12. What is the position of the grasshoppers in feeding.' 

 In what direction do the jaws move in feeding? Com- 

 pare this with the direction of movement of your own 

 jaws. What is the use of the palps } What do you think 

 is the use of the " molasses " or saliva that flows from the 

 mouth 1 



Respiration. 13. Describe the breathing movements of 

 a grasshopper and explain the relation of the movements 

 to inhalation and exhalation of air. 



14. Find the exact location and number of spiracles on 

 the abdomen. There are two pairs of spiracles on the 

 thorax. Find them. How do the spiracles prevent the 

 entrance of dust .'' 



Describe a trachea as seen in a mounted preparation with the aid of 

 a microscope or stereopticon. 



Protection. 15. Explain how the colors of the grass- 

 hopper may be protective or useful when at rest in its 

 natural habitat and when in flight. 



16. Does the shell cover the entire body.' What are 

 the advantages of such a covering .'' A shell is likely to 

 hinder activity, sensitiveness, and growth. How are such 

 disadvantages overcome in this case .' 



17. What senses are probably most relied upon to 



