74 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 94 



Chorthippus bicolor Charp. — The Acridinae (Tryxalinae) have the 

 typical acridid structure of the male genital organs, except that the 

 distal part of the dorsal lobe of the aedeagus is suppressed, and the 

 apical processes, which have the form of four long, closely appressed 

 prongs, arise directly from the proximal part (figs. 28 E, 29 C). 



The structure of the male genital organs of Chorthippus bicolor 

 is shown in figure 28. The aedeagus (E, Aed) includes a dorsal lobe 

 (dl) and a ventral lobe (vl), but the former consists principally of 

 the usual proximal part of the dorsal lobe (m), which bears directly 



-Male genitalia of Chorthippus bicolor (Acridinae). 



A, end of abdomen. B, dorsal lobe of aedeagus and lateral apodeme, left side. 

 C, aedeagal apodemes, dorsal view. D. epiphallus, dorsal view. E, phallic or- 

 gans and floor of genital chamber, lateral view. F, endophallus and distal 

 part of aedeagus. 



the four large apical processes above noted (B, n, p). The aedeagal 

 apodemes are well developed as long tapering arms extending forward 

 from the base of the aedeagus (B, Apa) in deep invaginations be- 

 neath the basal fold (E) ; their proximal parts are united by a strong 

 zygoma (C, s) in the under surface of the basal fold (B). From each 

 of the apical processes of the aedeagus (F, n, p) a. sclerite extends 

 proximally in the inner wall of the endophallic meatus (o, q). Here 

 the extremities of the dorsal pair of sclerites are united by a wide 

 dorsal bridge (t) , while the tapering ends of the ventral sclerites are 

 sharply bent upward (s) and then gradually expanded anteriorly to 



