LIST OF ILLUSTRATIONS 



FIGUBE PAOB 



1. The adult house-fly. ( x 5.) . 1 



2. Maggot of house-fly. ( x 3.) 4 



3. Puparium of house-fly. ( x 5.) 5 



4. Foot of house-fly, showing pulvilli, enlarged ... 7 



5. Plate of gelatine, showing colonies of bacteria in foot- 



prints of fly. (x 1.) After Underwood . . . 8 



6. Head and proboscis of house-fly. ( x 20.) ... 9 



7. Bin for holding manure. After Herms .... 22 



8. Hodge's trap for garbage can. After Howard . . 25 



9. A large fly trap. After Bull '26 



10. End of trap, showing hooks. After Bull ... 27 



11. Cross-section of trap. After Bull 27 



12. Wing of the lesser house-fly. ( x 10.) .... 36 



13. Wing of house-fly. ( x 10.) 36 



14. Wing of stable-fly (Muscina stabulans). (x8.) . . 37 



15. The cluster-fly. ( x 2.) 39 



16. Head and proboscis of the biting house-fly. ( x 8.) . 42 



17. Biting house-fly (Stomoxys calcitrans). (x3^.) . . 42 



18. The stable-fly (Muscina slabulans) . ( x 3.) . . .46 



19. The blow-fly. ( x 2.) 49 



20. Life history of a house mosquito. ( x 3.) After Howard 56 



21. Egg mass of the house mosquito, (x 5.) . . . 57 



22. Pupa of Culex, enlarged .58 



23. Head of female, left; male, right, (x 8.) . . .59 



24. Anopheles quadrimaculatus . (x7.) . . . .61 



25. Larva of Anopheles punctipennis, enlarged ... 62 



26. Anopheles punctipennis. ( X 7.) . . . .64 



27. Head of female Culex, left; female Anopheles, right. 



(x 8.) 65 



xi 



