12 



ANTENNAE. 



(including the tip) with from seventeen to twenty-nine fine, 

 curving, branched hairs (see Fig. 8).* Proboscis projecting as 

 already described and, with the palpi, curving slightly down- 

 wards ; reddish-brown below, glistening yellowish-white above 

 nearly to the tip, which is marked off by a slight constriction 



Fig. 8. 



Left antenna of Glossina pallidipes, Austen, cf , fi-om the inner side (X 60) ; the very 

 minute proximal joint of the arista is not visible in this view ; p, aperture of sense- 

 organ on third joint of antenna. (The arista is the process — really the distal 



! extremity of the antenna — bearing the branched hairs.) 



and -exhibits beneath a tiny but conspicuous black spot ; the 

 bulbous base of the proboscis is enwrapped posteriorly with a 

 fold of skin forming the hind wall of the buccal cavity. Palpi 



* The number of these hairs is usually about twenty-two or twenty- 

 three, but sometimes there are not more than seventeen or eighteen, while 

 in other cases there may be as many as twenty-eight or twenty-nine ; the 

 numbers on each arista may even be unequal in the same specimen. The 

 last one or two hairs (at the tip of the arista) are usually bare. 



