LIST OF ILLUSTRATIONS 



(1) Adult house-fly from above ; (2) Adult house-fly from below 



(after Cobb) ...... Frontispiece 



FACING PAGB 



1. Four batches of fly-eggs (after Newstead) .... 24 



2. Fly-eggs greatly enlarged (after Newstead) .... 25 



3. Fly-eggs greatly enlarged ; one shows the segments of the 



fly-larva through the egg-shell (after Newstead) . . 26 



4. Fly-eggs, larvae, and pupa (after Martin) . . . . p. 31 



5. The pupa taken from inside the pupa-case (after Howard) . p. 31 



6. A fly regurgitating fluid after a meal (after Martin) . . 34 



7. Leg and foot of a house-fly (after Martin) ... 34 



8. Diagram showing the digestive apparatus of the fly (after 



Martin) ......... 36 



9. The head, proboscis, and mouth-parts of a house-fly 



greatly enlarged (after Martin) ..... 36 



10. A mosquito-map of New Orleans ; fly -maps should be 



made in the same way (after Boyce) . . < . 52 



11. Mass of fly-pupae (cocoons) in stable-manure (natural size) 



(after Newstead) .; .59 



rii 



