186 THE BIOLOGY OF THE ANIMAL 



with that of the lobster ? How is the body pro- 

 tected ? What modes of locomotion has the ani- 

 mal ? What reasons can you give for the various 

 colors found on the body ? Do you find any para- 

 sites — e. g., mites — on the outside of the body, or 

 worms within? What means of protection from 

 its enemies has the locust ? 



h. The head. — What range of motion has the head ? Is 

 it segmented 1 Why ? Give reasons for its mode 

 of connection to the thorax. Why are there both 

 simple and compound eyes ? Why are they situ- 

 ated as you find them ? In what directions can 

 the locust look? Can the insect wink? How 

 does it close its eyes ? What is the probable use 

 of the antennte ? Why are they jointed ? What 

 reasons can you give for their position ? How do 

 you account for the structure of the labrum ? Of 

 the labium ? Put a living locust under a tumbler, 

 and feed the insect with a few blades of fresh 

 grass. In what direction do the jaws move? 

 Why? What is the use of each kind of jaw? 

 When standing on a fiat surface, can the locust 

 reach down to that surface with its mouth? 

 What is probably the use of the palpi? Do 

 they assist in feeding? Watch closely to see if 

 they do not pick up the food (grass), and hold it 

 while pieces are being bitten off. Are there any 

 nostrils ? 



c. The thorax. — What is the function of the prothorax? 

 Of the tubercle ? What reasons can you give for 

 the structure of the dorsal portions of the meso- 

 thorax and metathorax ? Of the ventral portions ? 



