NO. 6 



GRASSHOPPER ABDOMEN SNODGRASS 



25 



internal lateral of the preceding segments, the first being absent in 

 the eighth segment both in the female and the male (fig. 12). 



231. First external lateral muscle (figs. 13, 14)-— A thick muscle 

 arising in the lower anterior angle of the eighth tergum, inserted an- 

 teriorly on the outer face of the apodeme (Ap) of the eighth sternum. 



2^2. Second external lateral muscle (figs. 13, 14). — A small muscle 

 arising on the lower part of the eighth tergum below the spiracle, 

 inserted on the base of the apodeme of the eighth sternum. 



23 J. Third external lateral muscle. — Absent in the female. 



254, 255. Muscles of the spiracle (figs. 13, 14).— Same as in the 

 preceding segments. 



VII VIII IX 



24-7 267 



Fig. 12. — Muscles of the seventh, eighth, and ninth segments of the male 

 abdomen of Dissosteira Carolina, right side, inner view. 



The following muscles of the eighth segment of the female have no 

 representatives in the male. 



2j6. Short protractor of the ovipositor. — A short muscle with a 

 broad base arising on the side of the eighth tergum anterior to 2jo 

 (figs. 13, 14), inserted anteriorly on the anterior end of the apodeme 

 of the ovipositor (fig. 17 A, C). 



2§/. Anterior muscle of the median oviduct (fig. 13). — A slender 

 muscle arising on the end of the apodeme of the eighth sternum, ex- 

 tending mesally to its insertion on the anterior end of the median ovi- 

 duct. This muscle is absent in Melanoplus. 



2^8. Posterior muscle of the median oviduct (fig. 13). — A long 

 flat muscle arising on the end of the apodeme of the eighth sternum, 

 extending mesally and posteriorly to the posterior end of the median 

 oviduct. 



