THE LOCUST, OR GRASSHOPPER 49 



Directions. (For the field work, the Carolina locust will serve 

 as well, if not better, than any other species ; but wherever the 

 American locust is available it will be found better for dissection 

 because it is much larger. The Carolina locust has dark hind wings 

 with yellow borders, is found along the roadsides, and is dusty- 

 gray in color. The American locust is considerably larger and has 

 nearly transparent hind wings. 



An abundant supply of specimens may be caught with a net and 

 preserved in eighty-five per cent alcohol, but fresh specimens are 

 more desirable for dissection. Care should be exercised to get 

 both males and females for comparison and the nymphs in all 

 stages of development. The nymphs may be recognized from 

 their lack of fully developed wings.) 



A. FIELD STUDY OF THE LOCUST. Study the Carolina 

 locust in the field. Where are they found? Watch and 

 describe their habits of flight. How far do they usually 

 fly? Do they make any noise during flight? Are they 

 easily seen after they alight? Why is this? What color 

 are they ? What kind of places do they usually choose to 

 alight upon ? Have they any method of locomotion other 

 than that of flight ? When are they most active ? Deter- 

 mine by observing them on warm and cool days and on 

 frosty mornings and at noontide. What effect then has 

 temperature upon their activities ? Have they any enemies ? 

 How are they protected from their enemies ? 



B. STUDY OF A LIVING LOCUST. Place the locust under 

 a large glass jar and note its manner of walking. Note the 

 positions of the legs in the succeeding phases of walking. 

 How many legs has the locust? Note their variation in 

 size. Allow one to go free, and note what legs are used 

 in leaping. How far can it jump ? 



Note the respiratory movements of the abdomen. Count 

 the number per minute. Does it vary in different indi- 



HERRICK LAB. EX. 4 



