ENTOMOLOGY

COMMON FLIES AND HOW TO TELL THEM APART 148!. Body same as above species, stigmal plate with three S-shapedslits (figs. !3, !4).Stomo:cys calcitrana.B. Two great mouth-hooks; sUts m stigmal plate not winding.1. Body slightly rounded at rear end, faintly spined and with threeshort, pointed slits in stigmal plate (figs. !5, !6).Muacina stobulana.FIG. 14.-Larva of the little house fly, Fannia canicularill. Greatly enlarged. (Howardand Pierce, drawing by Bradford.)FIG. IS.-Dorsal view of eighth abdominalsegment of th.e larva of Fannia. caniculari8.Very highly magnified. (Drawingby Bradford.)FIG. 16.-Ventral view of terminal segmentsof Fa.nnia caniculariB; the ninthand tenth segments are comprised inthe small zone around the anus. Veryhighly magnified. (Drawing by Bradford.)!. Stigmal plates wide apart, each with three -straight slits nearlytransverse to the body and a distinct button (figs. !7, !8).Calliphora erythrocephala. Calliphora vomitoria.3. Stigmal plates about half their diameter apart, each with threestraight slits directed somewhat downward (fig. 31).Lucilia sericata.4. Stigmal plat.es less than their own diameter apart, each withthree straight slits pointed downward; no button (figs. 29, 30).Chrysomya macellaria.