NO. 6 



GRASSHOPPER ABDOMEN SNODGRASS 



75 



form the large lateral plates (u) of the endophalic walls. The ejacu- 

 latory sac (ejs) opens ventrally into the spermatophore sac of the 

 endophallus (sps) between the gonopore processes (y) of the lateral 

 plates, and the spermatophore sac discharges through the wide meatus 

 and the phallotreme. 



The epiphallus is a large sclerite of the usual type of structure 

 (fig. 28 D) seated on the floor of the genital chamber (E, Epph) at 

 the anterior end of the surface that forms the fold {hf) overlapping 

 the base of the aedeagus. 



IXSL 



Male genitalia of Mcrmiria maculipcnnis (Acridinae). 



A, end of abdomen. B, epiphallus. C, phallic organs with floor of genital 

 chamber and muscles of endophallic bulb. D, endophallus and distal part of 

 aedeagus. E, regulator mechanism of the gonopore, ventral view, closed. F, 

 same, gonopore open. 



Mermiria macidipennis Bruner. — The only differences in the male 

 genitalia between this species and the last are in details of form and 

 relative size of the parts (fig. 29). The epiphallus (B, C, Epph) has 

 the usual shape ; the basal fold (C, hf) forms a large hoodlike cover- 

 ing over the base of the aedeagus. The four large apical processes 

 of the aedeagus, in the retracted condition, project dorsally from the 

 supporting proximal part {m) of the dorsal lobe; the ventral lobe 

 {vl) projects like a trough beneath the latter. The endophallus is 

 large (D), but its lateral plates {11) with their apodemes (w) and 

 gonopore processes (y) are of typical form. The closing and opening 

 mechanism of the gonopore is easily studied in this species (E, F). 



