XXII 



LIST OF ILLUSTRATIONS 



FACING PAGE 



Ovipositor of Musca extended. 

 Distal -end of abdomen of Hippobosca. 

 Genital armature of Glossina, Male. 

 External genitalia of Phlebotomus. 

 Genital armature of Tabanus. 

 Superior clasper of Culex concolor. 

 Terminal segments of abdomen of Job- 



lotia, female ... .,.. ... 87 



Thoracic dorsal bristles. 



Thorax of Musca domestica, showing chae- 



totaxy. 



Thorax of Glossina palpalis, dorsal view. 

 Thorax of Stomoxys calcitrans, side view. 

 Thorax of Glossina palpalis, side view. 

 Diagram of parts of thorax. 

 Head of Musca domestica, seen from 



above 



Respiratory system of Culex. 

 Section through thorax of Haematopota. 

 Respiratory system of Tabanus. 

 Trachea, to show spiral thread. 

 Anterior thoracic spiracle of Musca. 

 Tracheal sacs supplied by the anterior 

 spiracle, Musca ... 



Alimentary tract of Tabanus. 



Transverse section through mid-gut of 

 Tabanus. 



Cells of proventriculus of Tabanus. 



Section through one of the mammillae of 

 the proventriculus of Tabanus. 



Villus from mid-gut of Tabanus. 



Transverse section through the proventri- 

 culus of Tabanus 



Malpighian tube from Tabanus. 

 Malpighian tube in section. 

 Alimentary canal of Culicoides kiefferi. 

 Alimentary canal of Phlebotomus minu- 



tus. 

 Cells from the wall of the hind-gut of 



Tabanus. 



Section through the rectum of Tabanus. 

 Section through the oesophagus of Culex, 



anterior end. 

 Section through the oesophagus of Culex, 



posterior end ... 



Alimentary tract of Culex. 

 Cells from the mid-gut of Culex. 

 Mid-gut of Culex distended with blood. 



91 



98 



104 



109 



