XX LIST OF ILLUSTRATIONS 



PLATE FACING PAGE 



Fig. 10. Maxilla of Similium indicum. 



Fig. 11. Labium of Phlebotomus papatasi. 



Fig. 12. Mandible of Phlebotomus papatasi, distal 

 end. 



Fig. 13. Maxilla of Phlebotomus papatasi. 



Fig. 14. Mandible of Phlebotomus papatasi. 



Fig. 15. Maxilla of Phlebotomus papatasi, showing 

 the apodeme. 



Fig. 16. Labrum-epipharynx of Phlebotomus papa- 

 tasi. 



Fig. 17. Hypopharynx of Phlebotomus papatasi. 



Fig. 18. Head of Phlebotomus, side view ... 29 



VII. Fig. 1. Head and proboscis of Culex fatigans. 

 Fig. 2. Distal end of maxilla of Culex. 

 Fig. 3. Distal end of mandible of Culex. 

 Fig. 4. Cross-section of proboscis of Culex. 

 Fig. 5. Mandible and maxilla of Culex ... 32 



Reference letters, Plates VII to XIII ... 32 



VIII. Fig. 1. Proboscis of Musca nebulo. 



Fig. 2. Isolated pseudotracheal rings. 

 , , Fig. 3. Pseudotracheal ring in situ. 



Fig. 4. Pseudotracheal channels seen from free 

 surface. 



Fig. 5. Prestomal teeth of Philaematomyia gur- 

 nei. 



Fig. 6. Distal end of labial gutter of Philaema- 

 tomyia insignis. 



Fig. 7. Labella of Lyperosia minuta, in position 

 of action. 



Fig. 8. Teeth and connected structures of Philae- 

 matomyia insignis ... ... 38 



IX. Fig. 1. Labrum-epipharynx of Musca nebulo. 

 Fig. 2. Prestomal teeth and pseudotracheal chan- 

 nels of Musca convexifrons. 



Fig. 3. Prestomal teeth of Musca pattoni. 



Fig. 4. Mentum and furca of Musca nebulo. 



Fig. 5. Labella of Musca domestica, showing 

 prestomal teeth. 



Fig. 6. Discal sclerite of Philaematomyia insig- 

 nis. 



Fig. 7. Proboscis of Philaematomyia gurnei. 



Fig. 8. Anterior wall of haustellum of Musca 

 nebulo, with discal sclerite and hypo- 

 pharynx ... ... ... 44 



X. Fig. 1. Proboscis of Philaematomyia insignis. 

 Fig. 2. Section through the lower part of pro- 



boscis of Philaematomyia insignis. 

 Fig. 3. Section through the lower end of pro- 

 boscis of Lyperosia minuta. 



