153 



The hard and slender proboscis of Stomoxys projects 

 straight out from the under part of the head and has a 

 swollen base, the bulb ; and the labellae at the tip bear 

 teeth with which the wound is made. In the deep labial 



PIG. 31. The Dusky Tsetse-fly (Glossina palpalis). Female. Mag- 

 nified 5 diameters. The chief carrier of "sleeping sickness.' 



Showing the characteristic resting position, the wings folded 

 flat over the back. 



gutter the slender and needle-like labrum-epipharynx and 

 hypopharynx lie concealed. The palps are short. 



The proboscis of Glossina is similar to that of Stomoxys : 

 but the rostrum is larger, the hypopharynx is more delicate, 

 and the whole proboscis is ensheathed and hidden by the 

 palps which are hollowed-out and long. 



L 



