108 



ROBERT NEWStEAt)— ON THE GENITAL ARMATURE OE THE 



Glossina tabaniformis, Westwood. 



This tsetse-fly bears a very striking external resemblance to Glossina medicorum, 

 Austen, but is separable from the latter by its slightly longer palpi ; by the 

 characters of the armature of the male ; and the greater length of the lateral 

 branches of the hairs on the arista. The exact specific differences between 

 these two species are set forth in the following table : — 



Lateral branches of the 

 hairs of the arista. 



Harpe of male. 



tabaniformis. 



Very long, the terminal 

 one about one half the 

 length of the free end 

 (tip) of shaft. 



With four narrow, 

 pointed appendages. 



medicorum. 



Very short, the terminal 

 one about one fifth the 

 length of the free end 

 of the shaft. 



With one broadly lan- 

 ceolate appendage. 



Fig. 1. — Male armature of Glossina tahaniformis, Westwood ; lateral view. 



Genital armature of the male (fig. 1). — Superior claspers {sc) free, of almost 

 uniform width throughout ; apices bluntly and asymmetrically bidentate ; bristles 

 very long. Inferior claspers {ic) very broad and rather short ; a few of the hairs 

 at the margin rather long, the rest short. Median process not reaching the distal 



