BASED ON A STUDY OF THE MALE GENITAL AKMATUltE. 



29 



It may be interesting to add that there are some curiously malformed bristles 

 present upon the right clasper (see fig. 1 3) ; these give off a fine lateral hair 

 towards the apex the tip of which points backwards, so that a reversed bifurca- 

 tion is produced. This striking malformation is not peculiar to this tsetse-fly as 

 similar instances have been observed in Glossina suhmorxitamf and also in other 

 species of the genus. 



Glossina longipalpis, Wiedemann. 



Genital armature of the male (figs. 14, Ioa). Superior clasper {sc) completely 

 united by a membrane and also fused medially ; base narrower than the greatest 

 width of the distal portion ; general outline broadly spathuliform ; stem in its 

 narrowest portion about one third the width of the distal portion ; distal margin, 

 on the outer lateral portion, with a large tooth-like extension ; the remaining 



Fig. 14. — Male armature of Glossina longip.ilpis, Wied. ; ventral view. 



portion broadly rounded and furnished with a closely set series of stout spines, the 

 smallest arising from near the base of the tooth-like projection ; these gradually 

 lengthen as they extend towards the base of the clasper ; bristles on the outer 

 lateral half unusually long, being equal to three-fourths the entire length of the 

 clasper ; there is also a single, but shorter bristle arising from the base of the 

 tooth-like projection which curves outwards and inwards in the same way as 

 has been observed in the corresponding bristles found in G. morsitans and G. sub- 

 morsitans ; each clasper has also a thin but strongly chitinised tlange-like 

 extension which meets the one on the opposite clasper with which it is apparently 

 fused, though a faint straight suture is visible between them ; this process 

 extends to the widest portion of the claspers where it terminates suddenly and 

 sometimes presents a small median emargination ; but there are no lobe-like 

 extensions as in G. morsitans and G. suhmorsitans. The dorsal surface of this 



