NO. 6 



GRASSHOPPER ABDOMEN SNODGRASS 



5 



organs of the male, however, are very simple in structure and in no 

 way resemble those of Acrididae (fig. 27 D). 



The abdomen of Tridactylidae has certain features that are sug- 

 gestive of the tetrigid abdomen, but in many respects it is quite dififer- 



AN2 AN3 PN3 IT 



S2 Prcx3 S5 IS IIS y 



Fig. 2. — Relation of the abdomen to the thorax in Acrididae, Tetrigidae, and 

 Tridactylidae. 



A, B, Mclanoplus mcxicamis. C, D, Tettigidca lateralis. E, F, Rhipipteryx 

 biolleyi. 



ent from the abdomen of either the Tetrigidae or the Acrididae. The 

 base of the tridactylid abdomen (fig. 2 E, F) presents characters that 

 are peculiar to the family, and will be described later. The first seven 

 pairs of spiracles lie in the lateral membranous areas of the dorsum 

 beneath the edges of the terga, where some of them may be contained 



