399 
Fig. i 26 a. 
(i). Glossina palpalis. Inner aspect of inner wall of labellum 
shewing the cutting apparatus; this is everted duiing 
the act of biting 
(2). Glossina palp aids. 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 ‘/’ the inter¬ 
locking teeth of the labrum and labium. 
(After Stephens and Newstead) 
