30 ROBERT NEWSTEAD—A REVISION OF THE TSETSE FLIES (GLOSSINA), 
flange is furnished with several rather large spines. Editum (e) with a large 
number of very long bristles, the longest of which extends beyond the middle of 
the superior 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 unique 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 
LAT?) 
HK. 
Fig. 15. Male armatures of Glossina pallidipes, Aust , and G'. longipalpis, Wied. 
A. Left superior clasper of G. longipalpis. B. Entire armature of G. pallidipes. 
C. Right superior clasper of (7. pallidipes. 
slender, but the length varies somewhat and occasionally they are asymmetrical, 
but in no single instance have they been found sufticiently 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 opposite side so that a fine straight median 
suture is formed ; this flange-like extension (C, 7) commences near the centre of 
