XXI 



PLATE 



Fig. 4. 



FACING PAGE 



Section through rostrum of Philaemato- 

 myia insignis ... ... ... 50 



Proboscis of Stomoxys calcitrans. 

 Proboscis of Glossina submorsitans. 

 Proboscis of Hippobosca maculata 



Labella of Haematobia stimulans. 

 Discal sclerite of Philaematomyia lineata. 

 Discal sclerite and end of labial gutter of 



Stomoxys calcitrans. 

 Lower end of pharnyx of Haematobia 



stimulans. 

 Isolated tooth of Haematobia stimulans... 



Section through narrow end of proboscis 

 of Hippobosca. 



Section through buccal cavity of Hippo- 

 bosca. 



Proboscis and sucking apparatus of Hippo- 

 bosca. 



Teeth on the labella of Hippobosca. 



Distal end of proboscis of Hippobosca. 



Articulation of fulcrum of Hippobosca. 



Distal end of proboscis of Lyperosia 

 minuta. 



Distal end of proboscis of Glossina, from 

 behind. 



Inner wall of labella of Glossina 



Exo-skeleton of Culex fatigans. 

 Thorax of Tabanus. 



Ventral plate of ovipositor of Haemato- 

 pota. 



Dorsal plates of ovipositor of Haematopota 

 Thorax of Chrysops dispar, from behind. 

 Halter of Chrysops dispar. 

 Tarsus and foot of Haematopota. 

 Apodeme of meso-thorax of Tabanus. 

 Foot of Culex fatigans. 

 Prosternal region of Haematopota. 

 A leg showing the segments 



Thorax of Stomoxys calcitrans. 



Scales of ptilinal membrane of Philae- 

 matomyia insignis. 



Thoracic inlet of Stomoxys, from internal 

 aspect 



Comstock and Needham's ' urotype '. 

 Wing of Anopheles. 

 Wing of Haematopota. 

 Wing of Stomoxys. 

 Wing of Glossina 



55 



58 



63 



69 



72 



75 



82 



