ENTOMOLOGY

144 SANITARY ENTOMOLOGY5. Stigmal plates at bottom of a deep pit; each plate has threeslits pointing downward, plates less than their diameter apart; nobutton.Sarcophagidae.F OIIlnia canicularis Linnaeus and Fownia scalaris }"abriciusThese larvre are brownish yellow in color. The body is quite flattened,narrow and pointed in fr~mt. The peculiar spines or projections on thebody will separate them from the other species. The larva averagesnearly three-eighths of an inch in length (figs. 14-19). (See ChapterVIII.)FIG. 1 'T.-Larva of Fannia scalari" the latrine fly, .greatly magnified.Pierce, drawing by Bradford.)(Howard andFIG. IS.-Dorsal view of eighth abdominalsegment of the Fann,ia 8Cala.ri,. Veryhighly magnified. (Drawing by Bradford.)FIG. 19.-Ventral view of terminal segmentsof Fa.7IIIIia sca.laris; the ninthand tenth segments are comprised inthe small zone around the anus. Veryhighly magnified. (Drawing by Brad~ford.)Since the larvre of this genus feed on fruit and vegetables that arejust beginning to decay, one can readily see that they are often swallowedby people. There are many records of the passage of larvre or maggotsof this genus. At least some species of this genus breed in human feces,therefore they may be possible conveyers of disease.Musca domestica LinnaeusThe larva of the house fly is slender and tapering in front and largeand somewhat rounded behind. From above, the head is divided into two