30 



ROBERT NEW8TEAD — A REVISION OF THE TSETSE FLIES (gLOSSINa), 



flange is fnniished with several rather large spines. Editum (r) with a large 

 number of very long bristles, the longest of. which extends beyond the middle of 

 the snjDerior claspers. The inferior claspers are so contorted and folded that so 

 far it has been impossible to interpret their true character ; one can only say 

 that they are provided dorsally with bristles of great length In all probability 

 they may be seen best when mounted in profile but at present we have no more 

 material available for examination. 



The remarkable and imique form of the claspers will, however, enable the 

 student readily to distinguish the males of this tsetse-fly from any of the other 

 known species. Fourteen examples have been examined. 



Glossina pallidipes, Austen. 



Genital armature of the male (fig. 15). Superior claspers in their general form 

 closely resembling those of G. longipalpis, but the stem is relatively broader and 

 the broad distal portion is much more rounded and produced inwardly. The 

 single hairs on the distal or posterior margin are generally very short and 



A 



Fig. 15. Male armatures of Glossina pallidipes, Aust , and G. loiif/ipalpis, Wied. 



A. Left superior clasper of G. longipalpis. B. Entire armature of G. pallidipes. 



C. Right superior clasper of G. pallidipes. 



slender, but the length varies somewhat and occasionally the}- are asjmmeti-ical, 

 but in no single instance have they been found sufficiently long to overlap or 

 meet in the median line. Posterior lateral tooth {t) set in slightly from the 

 outer lateral margin ; each clasper has a thin but strongly chitinised flange-like 

 extension which meets the one on the ojjposite side so that a fine straight median 

 suture is formed ; this flange-like extension (C, fl) commences near the centre of 



