LIST OF ILLUSTRATIONS 
16. 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 rndis) ; greatly en¬ 
larged . facing 238 
23. The biting house fly ( Stomoxys calcitrans) ; 
greatly enlarged. facing 238 
24. The little house fly ( Homalomyia brevis) ; 
greatly enlarged. facing 246 
25. The stable fly ( Mnscina stabulans) ; greatly en¬ 
larged . facing 246 
26. The cheese fly ( Piophila casei) ; enlarged facing 250 
27. The fruit fly ( Drosophila ampelophila) ; en¬ 
larged . facing 250 
28. Lucilia ccesar; enlarged. facing 254 
29. Calliphora erythrocephala; enlarged . facing 254 
30. Phormia terrcenovce ; enlarged . . . facing 254 
31. Sarcophaga assidua; enlarged . . . facing 256 
32. Sepsis violacea; enlarged .... facing 256 
33. Scatophaga furcata; enlarged . . . facing 254 
34. Phora femorata; enlarged greatly .... 257 
35. Scenopinus fenestralis; 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 
