GRASSHOPPER ABDOMEN SNODGRASS 



45 



valvula (aiv). Both anterior and posterior intervalvulae (E, aiv, piv) 

 are present in Rhipipteryx as in Acrididae and Tetrigidae, and a small 

 median sclerite (/) before the anterior intervalvula gives attachment 

 to a pair of convergent muscles (5). 



The lateral apodemes of the ovipositor of Rhipipteryx are long 

 spatulate plates arising between the bases of the valvulae, but each is 

 more specifically connected with the corresponding ventral valvula 

 (fig. 19 D, Ap), rather than with the dorsal valvula as in Acrididae. 

 Walker describes the ovipositor apodemes of R. forcipata as shelf like 

 extensions of the lower edges of the ninth tergum, having the same 



tQ. — Abdomen and ovipositnr (jf Rhipipteryx biollcyi. 



A, terminal half of abdomen with ovipositor. B, lateral view of eighth seg- 

 ment removed from seventh. C, left view of ninth segment and ovipositor. D, 

 mesal view of right ventral valvula, with right apodeme and muscles. E, ven- 

 tral view of ninth tergum supporting second and third valvulae. F, dorsal view 

 of tenth and eleventh segments, showing lobes (papfl) of paraprocts. (Letter- 

 ing as on fig. 17.) 



relation to the vahulae as the free apodemes of Acrididae. The writer, 

 however, finds no tergal connections of the apodemes in R. biollcyi, 

 in which the structures appear to be identical with the intervalvular 

 apodemes of Acrididae. They give attachment to muscles very nearly 

 the same as those of the Acrididae in their distribution to the basival- 

 vulae (fig. 19 C. D. /). the ventral valvulae (_'). the ninth tergum 

 (C, 5), and the dorsal valvulae (C, E, 4). 



THE FEMALE GENITAL CH.AMBER AND THE SPERMATHECAL OPENING 



The genital chamber, or copulatory pouch, of the female grass- 

 hopper is a fiat horizontal invagination of the integument beneath the 

 bases of the ventral valvulae and above the posterior margin of the 



