PLATE XI 



Figure 1. The proboscis of Stomoxys calcitrans. b., the bulb. 

 Note the resemblance of the buccal cavity, which in the 

 Stomoxydinae is merely a tube up which the food is 

 conveyed to the pharynx, to a trachea. In a fresh 

 preparation the tracheae can be seen on either side of 

 it, expanding above into air sacs, x 36. 



Figure 2. The proboscis of Glossina submorsitans. d.a., the 

 dark area on the posterior surface of the labella, as 

 shown in Plate XIII, figure 8. x 50. 



Figure 3. The proboscis of Hippobosca maculata, drawn from 

 a cleared preparation dissected out of the head. The 

 parts are shown in the position of full extension. In 

 the resting position the whole of the piercing part of 

 the haustellum is concealed between the palps, while 

 the bulb is within the head. Compare with figure 3, 

 Plate XIII. x 44. 



lete contract 



