399 



Fig. 1 26 A. 



(i). Glossina palpalis. Inner aspect of inner wall of Idbellum 



skewing the cutting apparatus ; this is everted duiing 



the act of biting 



(2). Glossina palpalis. Transverse (schematic] section of the 

 proboscis just in front of the bulb, e = hypopharynx, f the mem- 

 branous portion of the labrum which is closely applied to the 

 ' horns ' of the hypopharynx. Above 'f 9 the inter- 

 locking teeth of the labrum and labium. 

 (After Stephens and Newstead) 



