BASED ON A STUDY OP THE MALE OENITAL ARMATURE. 



25 



iiistiinoe however lias it been found fully extended, but in all cases it was seen 

 lying' in a folded and contorted position similar to that which is shown in fig. 10 

 on the right side of the illustration {ap). 



Though closely related to G. palpalis, the armature of the male may be easily 

 determined by the great length of the falciform or claw-like extensions of the 

 superior claspers ; the inferior claspers are also much more gradually attenuated 

 and the toe or apex of the foot-like process is furnished with three or four small 

 hairs. There are also other minute differences such as the form of the vesica 

 and the juxta, but the most marked morphological character is the great length 

 of the tooth-like extension of the superior clasper which gives this structure a 

 very distinct and marked character. 



Glossina tachinoides, Westwood. 



Genital ur mature of the male (fig. 11). — Superior claspers {sc) united by a 

 membrane ; in shape they are identical with those in Glussiiia palpalis, but are 



Fig. 11. — Male armature of Glossina tachinoides, Westw. ; ventral view. 



relatively smaller. Connecting membrane (cm) spinose on both surfaces, and 

 deeply divided centrally. Inferior claspers (zc) with the inner lateral margin 

 proximally produced and broadly rounded : beyond this prominence the process 

 is broad and parallel-sided : the outer lateral margin at the distal extremity is 

 suddenly rounded and deeply emarginate ; the inner lateral portion being extended 

 into a foot-like process on the edge of which are two or three minute hairs. The 

 editum (e), the harpes (A) and the vesica (v) are all specifically identical with the 

 corresponding organs in G. palpalis ; and although these organs respectively 

 may appear to differ slightly in the illustrations, the differences are simply due to 

 the orientation in the mounted preparations. 



It may be readily seen on comparing the figure of G. tachinoides with that of 

 G. palpalis that the morphological characters of the species are almost identical ; 

 the only salient characteristic being the curious form of the inferior claspers in 

 G. tachinoides, which will at once serve to distinguish the male of this tsetse from 

 the male of G. palpalis. 



