64 



EXTERNAL ANATOMY. 



oi/A 



Fig. 39. — Abdomen of female of Melanoplus bivittatus. — A, lateral 

 view; B, dorsal view; C, ventral view; D, egg-guide. Original. 



The eighth sternum is nearly twice as long as the seventh, 

 and forms the sub-genital plate {g. pi). Its posterior end is 

 pointed, curved upwards, and its extremity lies between the 

 plates of the ovipositor. 



In a dorsal view. {B), the first ten segments are substan- 

 tiallvlike those of the male. The shield-shaped eleventh tergum 

 is shorter and wider than in the male. On each side of it, at 

 a little lower level, is the triangular podical plate {p. pi), 

 which is not vertical, as in the male, but is so placed that its 

 broad surface is seen in a dorsal view. Above or dorsal to 

 the podical plates, are the cerci, much smaller than in the 

 male, but attached to the posterior margin of the tenth 

 tergum. As in the male the anus is between the podical 

 plates, just below the eleventh tergum. The space between 

 the podical plates above and the sub-genital plate below is 

 filled by the ovipositor, the top of which projects to some 

 distance beyond the eleventh tergum. 



In a sideview, (A), theterga are substantially likethoseof 

 the male, but the small cerci do not hide any portion of the 



