x LIST OF ILLUSTRATIONS 



FIG. PAGE 



1 6. 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 



1 8. 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 (Pollcnia rudis) ; greatly en- 



larged facing 238 



23. The biting house fly (Stomo.vys calcitrant) ; 



greatly enlarged facing 238 



24. The little house fly (Homalomyia breris) ; 



greatly enlarged facing 246 



25. The stable fly (Muscina stabulans) ; greatly en- 



larged facing 246 



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



27. The fruit fly (Drosophila ampclophila) \ en- 



larged facing 250 



28. Lucilia ccesar ; enlarged facing 254 



29. Calliphora erythrocephala; enlarged . facing 254 



30. Phormia tcrrcenovcc ; enlarged . . . facing 254 



31. Sarcophaga assidua; enlarged . . . facing 256 



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



33. Scatophaga fnrcata; enlarged . . . facing 254 



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



35. Scenopinns fencstralis; enlarged 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 



