12 Practical Zoology. 



2. With the forceps seize one of the outer wings by its lower 

 edge, near the anterior end, and draw it horizontally forward, till 

 it makes a right angle with the body, and pin in this position. 

 Seize the inner wing by its lower edge near the posterior end, and 

 pull forward to its fullest extent, observing how it is folded ; pin 

 this wing as expanded, and make a drawing of both wings as thus 

 seen. Cut a piece of paper the same size and shape as the inner 

 wing, and fold it as the inner wing is folded. 



3. The framework of the wings is composed of veins. 



4. Compare the inner and outer wings in size, shape, color, 

 texture, position, and use. 



THE LEGS. 



1. Note their number, arrangement, and mode of attachment. 



2. Study carefully one of the hind legs. 



a. A short segment, near the body, is the coxa. 



b. A smaller segment is the trochanter. 



c. The large segment is the femur. 



d. The slender segment is the tibia. 



e. The remainder is the foot, or tarsus ; count its segments, 

 and examine thoroughly, using a lens. Examine the joint be- 

 tween the femur and tibia, moving the parts back and forth. 

 Note, also, how these parts fit together when the leg is drawn up. 

 Remove a hind leg, and make a drawing showing all these parts. 



3. In how many ways does the grasshopper travel? In what 

 order are the legs moved in walking? 



4. Grasshoppers make a shrill sound (stridulation) by rubbing 

 the inner surfaces of the hind legs against the outer wings. 



5. In what different ways does the grasshopper keep from slip- 

 ping when it jumps ? Remove the legs and wings ; make drawings 

 of the thorax as seen from the side, from above, and from below. 



THE ABDOMEN. 



1. Count the abdominal rings. 



2. Observe two grooves running along the under surface of the 



