HARD PARTS OF THE GRASSHOPPER. 



257 



adult, but they have no wings, and the abdomen, in both 

 sexes, consists of eleven distinct terga (Fig. 138, A, 6, 

 7, 8, 9, 10, 11), and ten distinct sterna (Fig. 138) A, 6 1 , 

 7 1 , 8 l , 9 l , 10 1 ). At the tip of the abdomen there are a 

 pair of flattened podical plates (Fig. 138, A, b) and out- 

 side these a pair of long, slender cerci (Fig. 138, A, d). 

 In the female, two long, slender processes (Fig. 138, A, h), 

 soon make their appearance on the middle of the eighth 



FIG. 138. 



FIG. 138. Development of ovipositor and abdominal segments of a 

 grasshopper (Locusta virridissima). From Dewitz. " Ban und Entwicke- 

 lung des Stachels, und der Legescheide einiger Hymenopteren und 

 ili-r 'jrilnen Heuschrecke." Zeit. f. Wiss. Zool. xxv. 1875. Taf. xii. 

 Figs. 6, and 7. 



A. Ventral view of the abdominal segments of a young female 

 grasshopper; showing the six prominences, from the eighth and ninth 

 sterna, which are to become the parts of the ovipositor. B. The same a 

 little older. C. Side view of B. 5, 6, 7-11. Terga of the abdominal 

 segments. 5', 6', T-lff. Sterna of the abdominal segments. 6. The 

 podical plates, c. Tip of eleventh tergum. d. Cerci. g. Upper plates 

 of ovipositor, h. Lower plates of ovipositor, i. Central plates of ovi- 

 positor. 



sternum. These lengthen rapidly, so as to cover up the 

 ninth and tenth sterna as shown in Fig. 138, B and (7, 

 and become the two ventral pieces of the ovipositor 

 (Fig. 139, qpi). 



