144 SANITARY ENTOMOLOGY 



5. Stigmal plates at bottom of a deep pit ; each plate has three 

 slits pointing downward, plates less than their diameter apart ; no 

 button. Sarcophagidae. 



Famnia canicvlaris Linnaeus and F'^armia scalaris Fabricius 



These larvae are brownish yellow in color. The body is quite flattened, 

 narrow and pointed in front. The peculiar spines or projections on the 

 body will separate them from the other species. The larva averages 

 nearly three-eighths of an inch in length (figs. 14-19). (See Chapter 

 VIII.) 



Fig. 17. — Larva of Fannia scalaris, the latrine fly, greatly magnified. (Howard and 

 Pierce, drawing by Bradford.) 



Fig. 18. — Dorsal view of eighth abdominal Fig. 19. — Ventral view of terminal seg- 

 segment of the Farmia scalaris. Very ments of Fammia scalaris; the ninth 



highly magnified., (Drawing by Brad- and tenth segments are comprised in 



for A.) the small zone around the anus. Very 



highly magnified. (Drawing by Brad- 

 ford.) 



Since the larvae of this genus feed on fruit and vegetables that are 

 just beginning to decay, one can readily see that they are often swallowed 

 by people. There are many records of the passage of larvae or maggots 

 of this genus. At least some species of this genus breed in human feces, 

 therefore they may be possible conveyers of disease. 



Musca doTnestica Linnaeus 



The larva of the house fly is slender and tapering in front and large 

 and somewhat rounded behind. From above, the head is divided into two 



