HARD PARTS OF THE GRASSHOPPER. 



253 



(vi.) Projecting beyond the end of the eleventh ter- 

 gum the bilobed end of the ventral sub-genital plate (a) 

 is visible. 



(vii.) Raise up the end of the eleventh tergum and 

 notice below it a pair of vertical plates (Figs. 134 and 

 135, 6), one on each side of the median line, the podical 

 plates. Between these plates is the anus, and below them 

 the genital chamber, already noticed. 



FIG. 135. 



PIG. 135. Side view of tip of abdomen of male Acridium America- 

 num. (Drawn from nature by W. K. Brooks.) 

 For explanation of letters and figures see Fig. 137. 



c. In a side view (Fig. 135) notice that from the second 

 to the eighth segment the sterna are equal in length to 

 the corresponding terga, and the constrictions between the 

 segments entirely surround the body. 



(i.) The suture, which on the dorsal surface marks the 

 line between the ninth and the tenth terga, does not ex- 

 tend down onto the sides of the body, and the lower mar- 

 gins of these two terga form a single plate. 



(ii.) Below this plate is the ninth sternum (Fig. 135, 9*), 

 as long as the area formed by the union of the ninth and 

 tenth terga. 



