24 ANIMAL BIOLOGY 



body. It will be necessary to puU sideways on the 

 mouth parts to see this inner part. These three 

 parts form one appendage called the maxilla (plural 

 maxillce), or helping jaws. 

 When you have found these three parts of a maxUla, 

 describe them. 



9. (Demonstration or home work.) Place several grass- 



hoppers in a cage or a glass jar with moistened 

 leaves of clover, grass, .or lettuce. If these 

 insects refuse to eat, try others till you find 

 some that will eat. 



a. Describe the movements of the head and also the 



movements of the mouth parts while the grass- 

 hopper is eating. 



b. Which mouth parts must do most of the biting 



of the leaf? Give reason. 



10. (Optional.) Make a drawing, at least four times natural 



size (X 4) of the face view of a grasshopper. Label 

 anteima, compound eye, simple eye, upper lip. 



C. Organs of the thorax ; locomotion. 



1. How many legs has a grasshopper? Which pair is 



the largest? 



2. Make a sketch (X 4) to show the following parts of 



one of the hind legs : (1) a large segment 

 nearest to the thorax, the thigh or femur; 



(2) the next segment to the femur, the tibia; 



(3) the part that rests on the ground when the 

 insect walks, the foot or tarsus. Use a magnifier 

 to see the several segments in the tarsus, the 

 little claws at the tip end. and a little pad be- 

 tween the claws. Label femur, tibia, segments 

 of the tarsus, claws, pads. 



3. (Optional.) Make a sketch (X 4) of one of the smaller legs 



to show the size and shape of the parts. Use the 

 same labels as in the drawing of the hind leg. 



