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. 



Fannia canicidaris Linnaeus and F'Onnia scalaris Fabricius 



These larvje 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 lana averages 

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



vm.) 



Fig. 17. — Larva of Faiinla scalaris, the latrine fly, greatly magnified. 

 Pierce, drawing by Bradford.) 



(Howard and 



Fig. 18. — Dorsal view of eighth abdominal 

 segment of the Fannia scalaris. Very 

 highly magnified. (Drawing by Brad- 

 ford.') 



Fig. 19. — ^'entral view of terminal seg- 

 ments of Fannia scalaris; the ninth 

 and tenth segments are comprised in 

 the small zone around the anus. Very 

 highly magnified. (Drawing by Brad- 

 ford.') 



Since the lar\'ae 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 lars'se 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 domestica 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 



1 



