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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 94 



very slender; those of the dorsal pair are united by an arched bridge 

 (t) in the dorsal wall of the meatus; each sclerite of the ventral pair 

 bears a large, thin, oval plate (v) in the lateral wall of the phallotreme 

 cleft. The ejaculatory sac (ejs) is relatively large and is separated 

 from the spermatophore sac (sps) by strong gonopore processes 

 (y) of the lateral endophalic plates. 



Melanoplus differentialis (Thomas). — The ninth sternal lobe is 

 short in this species (fig. 36, IXSL), and from its dorsal margin the 

 exposed part of the pallium (B, Pal) rises like a dome behind the 

 eleventh segment. The phallic organs (fig. 37 A) are somewhat 

 crowded in the rather small genital chamber. The epiphallus (Epph) 

 is large but weakly sclerotized, and is deeply sunken into the folded 



Fig. 36. — Male abdomen of Mclaiwfliis differentialis (Cyrtacanthacrinae). 

 A, entire abdomen. B, end of abdomen, lateral view. C, same, dorsal view. 



floor of the genital chamber. The basal fold {hf) is bilobed. The 

 dorsal lobe of the aedeagus is distinctly divided into a proximal part 

 (A, B, 77z) bearing the aedeagal apodemes (B, Apa), and a large cylin- 

 drical distal part (r). The ventral lobe (A, vl) is relatively small. 

 From the distal end of the aedeagus there projects only one pair of 

 apical processes (A, B, C, D, n), which are the usual anterior dorsal 

 processes continuous from the dorsal sclerites of the phallotreme cleft 

 (D, 0). The ventral processes are present, but they are concealed 

 within the phallotreme cleft (C, p), since they arise deeply from the 

 walls of the latter and do not project from the apex of the aedeagus. 

 The endophallus (D) has the usual structure, though the sperma- 

 tophore sac {sps) is much reduced, and the ejaculatory sac {ejs) is 

 turned upward against its posterior w-all. 



