254 



HANDBOOK OF INVERTEBRATE ZOOLOGY. 



(iii.) Running backwards from the posterior margin of 

 the tenth tergum is the flat cercus (Fig. 135, d). 



(iv.) Above this a portion of the eleventh tergum (Fig. 

 135, ii) is visible. 



(v.) Below and internal to the cercus is the podical 

 plate (Fig. 135, 6), triangular in a side view; and below 

 this the large sub-genital plate (Fig. 135, a), which is 

 joined to the ninth sternum. 

 10. The abdomen of the female. 

 a; In a ventral or side view (Fig. 137), notice : — 

 (i.) The first to the seventh sterna, like those of the 

 male. 



(ii.) The eighth sternum (Fig. 137, 

 8*) is nearly twice as long as the 

 seventh, and forms the sub-genital 

 plate. Its posterior end is pointed, 

 curved upwards, and its extremity 

 (Figs.^ 139, 11*) lies between the 

 plates of the ovipositor. 



Fig. 136. — Dorsal view of end of abdomen 

 of female Acridium Amerieanum. (Drawn 

 from nature by W. K. Brooks.) 



Explanation of letters and figures for Figs. 

 134 and 136: — 



7, 8, 9, 10, 11. Terga of the seventh to 

 eleventh abdominal somites. a. Male sub- 

 genital plate, h. Podical plates, c. Free end 

 of eleventh tergum. d. Cerci. e. Suture. 

 <j. Dorsal plates of ovipositor. h. Ventral 

 plates of ovipositor. L Central plates of ovi- 

 positor, or "egg-guides." 



I 



Fig. 136. 



5. In a dor.sal view (Fig. 136), notice : — 

 (i.) The first ten segments, substantially like those of 

 the male. 



