FORM AND FUNCTION 



261 



or lateral portion is the pleiirmn ; and the upper or 

 dorsal portion is the notnm. 



Do the sutures dividing these sclerites extend down 

 to the ventral margins of the pronotum? Make a 

 drawing of the lateral view of the prothorax. 



Prothoracic Leg 1 . For study it will be better to remove 

 the leg from the body. 



Coxa. Xote the globular joint. This is the coxa. 

 (Fig. 198, f.) 



Trochanter. This second segment is a short, much 

 smaller segment than the coxa, and more readily seen 

 from the inner side. (Fig. 11 IS, r/.) 



Femur. The next segment of the leg is the femur. 

 This is the largest and most prominent portion of the 

 leg. (Fig. 108, ft.) 



Tibia. Continuing outward, the next segment is the 

 tibia, a segment more slender than the femur. How 

 does the inner margin differ from the inner margin of 

 the femur? (Fig. 198, /.) 



The rest of the leg is composed of a number of freely 

 movable segments, known collectively as the tarsi. In 

 the grasshopper there are three of these movable joints, 

 the outer or end one bearing a pair of claws and a horse- 

 hoof-shapcd pulvillus between the claws. 



Make a drawing of the thoracic leg. 



Mesothorax. 



In order to study the mesothorax, remove the pro- 

 thorax. We will study first the lateral view, then the 

 ventral view, and lastly the dorsal view. 



Episternum. Extending from the front half of the 

 mesothoracic coxa, dorsad to the base of the first pair of 



