X LIST OF ILLUSTRATIONS 



FIG. PAGE 



i6. A diagrammatic figure of the alimentary canal 



of the house fly; greatly enlarged ... 29 



17. The house centipede {Scutigera forceps) ; some- 



what enlarged (after Marlatt) . . facing 82 



18. Colonies of bacteria on a sterilized plate, aris- 



ing from fly tracks facing 108 



19. Details of window trap (redrawn from Parrott) 181 



20. Fly trap for garbage can . . . . facing 214 



21. Poster issued by the Florida State Board of 



Health ; greatly reduced .... facing 224 



22. The cluster fly {Pollenia rudis) ; greatly en- 



larged facing 238 



22,. The biting house fly {Stomoxys calcitrans) ; 



greatly enlarged facing 238 



24. The little house fly {Homalomyia hrevis) ; 



greatly enlarged facing 246 



25. The stable fly {Muscina stabnians) ; greatly en- 



larged facing 246 



26. The cheese fly {Piophila casei) ; enlarged facing 250 

 2y. The fruit fly (Drosophila ampclophila) ; en- 

 larged facing 250 



28. Lucilia ccesar ; enlarged facing 254 



2Q. Calliphora erythrocephala; enlarged . facing 254 



30. Phormia terrccnovcc ; enlarged . . . facing 254 



31. Sarcophaga assidna; enlarged . . . facing 256 



32. Sepsis violacea; enlarged .... facing 256 



33. Scatophaga fnrcata; enlarged . . . facing 254 



34. Phora femorata; enlarged greatly .... 257 



35. Scenopinus fencstralis: tnXdiVgQd 258 



36. Scantling for framework of single-seated privy 



(Redrawn from Stiles) 295 



37. The framework for a single-seated privy (Re- 



drawn from Stiles) 297 



