164 



ENTOMOLOGY FOR MEDICAL OFFICERS 



the wing. Further, the anterior cross-vein is more than 

 ordinary oblique. 



Fig. 64.— Wing of Glossina. 



The proboscis (Fig. 65), which is chitinous and projects 

 horizontally, consists of a bulbous base which contracts 

 abruptly to a long and very slender shaft. As in other 

 Muscidce it is longitudinally grooved dorsally to hold the 



arista. 



hypoph. 

 label. 



Fio. 66.— Head of Olossina. 



needle-like epipharynx and the tubular filamentous hypo- 

 pharynx (Fig. 65) ; the two last organs form by apposition 

 and basal interlocking a suctorial tube. 



