24 EGBERT NEWSTEAD — A KEVISION OE THE TSETSE-FLIES (gLOSSINA), 



gradually as they approach the base of the falciform tooth, from which there 

 arises a single bristle of much greater length than the rest ; median group of 

 bristles very long. Connecting membrane divided medially as in the other 

 members of this group. Inferior claspers (ic) gradually attenuated, distally 

 forming a leg-like extension terminating in a foot-like ])rocess bearing three or 

 four slender and relatively long hairs ; basal portion densely clothed with long 

 bristles. Editum (e) rather large ; bristles not reaching beyond the middle of 

 the inferior clasper. Harpes and penis-sheath similar to those in G. palpalis ; 

 vesica with two inwardly curved sclerites, the apices of which meet in the middle 

 line ; distal portion membranous. 



Fig. 10. — Male armature of Glossina calig/nea, Austen. 



Lying immediately in advance of the apex of the inferior claspers is a short 

 chitinous cylindrical tube {up 1), the outer wall of which is extended backwards 

 or proximally, forming a long band-like sclerite which is apparently connected 

 with the inferior clasper ; attached to the circular orifice of the short tube is a 

 very long, narrow, membranous sac or vermiform appendix {up) bearing upon its 

 exterior surface a number of minute spines arranged more or less in transverse 

 rows. This organ has been observed in other species of Glossina ; in no other 



