STUDIES OF INSECTS 25 



adult. In incomplete metamorphosis the stages are 

 nymph and adult. 



Observations. 



The Body. i. Show how the shape of the grasshop- 

 per's body is well adapted to its needs. 



2. Which region of the body is the thickest? What 

 seems to be the reason for this ? Which regions are 

 capable of movement ? 



Locomotion. 3. What are the various kinds of locomo- 

 tion a grasshopper can use ? Which are used in the viva- 

 rium and which when free in the laboratory ? 



4. Which legs are used in jumping ? How are these 

 legs especially adapted to this, in length, structure and 

 direction? Could a grasshopper jump if the third pair of 

 legs were arranged like the other two pairs ? Why ? 



5. How is the animal able to cling to grass stems and 

 not slip down ? What is the direction of the body in 

 relation to the stem or grass blade ? 



6. What is the position of the wings when at rest ? 

 when in use ? How do the hind wings fold ? How are 

 the principal veins of the wings arranged to permit or 

 facilitate this folding? 



7. Contrast the fore and hind wings with respect to 

 thickness, size, and use. 



8. To which somites of the thorax are the wings attached ? 

 Nearer which surface, the dorsal or ventral ? Why ? 



Sense Organs. 9. Discover all you can about the uses 

 of the antennae by carefully observing grasshoppers at 



Examine a preparation of the compound eye with the low power or 

 as demonstrated with the stereopticon. What is the shape of an eye 

 element of the compound eye ? About how many eye elements are 

 there in a compound eye ? 



