ENTOMOLOGY

140 SANITARY ENTOMOLOGYstripes. Joints of legs reddish at base. Abdomen is gray andin certain lights there are paler gray areas which look likespots but there are never any definitely outlined spots. Mouthpartssuctorial type (fig. lOa). Another stable fly (plate III,fig. fl). . Muscma stabvlans Linnaeus.II. Bluish, or greenish flies.1. Large blue fly, with grayish thorax (average length three-eighthsto seven-sixteenths of an inch). 'l'his fly is rather broad androbust and in certain lights the abdomen ehows paler, reflectingareas but not definite' spots. Mouth-parts suctorial type (fig.lOa). The common blow fly. Lower part of head (cheeks) reddishand the beard black. Calliphora erythrocephala Meigen.fl. A slightly larger fly than the preceding but more shiny and adeep greenish blue. Abdomen slightly more pointed and of an/'r1tnCA DOME6TleA. L. I'lrNNI/I e"Hir:UI.AItM L. S~()H()1C y,s CALC/TRANS.FIG. Ht-Abdominal markings of three common house flies: a, the house fly, MU8cadomeBticaj b, little house fly, Fannia caniculariBj c, stable fly, Stomoa:yB culcitrO/llJ/l.(Greene.) In these diagrams the relative size of the abdomen Is shown. Thelight areas in a and b represent yellow marldngs and are variable in size. In fig.c the markings of the last segment may be present or absent.even coloration (no reflecting spots). Mouth-parts suctorial type(fig. lOa). Lower part of head black and the beard red. Anotherblow-fly (plate I, fig. 1). Calliphora vomitoria Linnaeus.8. Much smaller fly, shiny green with a decided whitish bloom onthe thorax and abdomen. Mouth-parts suctorial (fig. lOa). Agreen bottle fly.'Lucilia sericata Meigen.4. A slightly smaller fly, shiny, metallic green with a. decided bluishtinge and no white bloom. Mouth-parts suctorial (fig. lOa).Green bottle fly (plate I, fig. fl). Lucilia caesar Linna~us.o. A dark green fly, little larger than the above species. It is shinywith bluish tinge. Top of thorax with three dark longitudinalstripes. Thorax often has a bronze tinge. (Average length fivesixteenthsto three-eighths of an inch.) Mouth-parts of the suctorialtype (fig. lOa). The "screw-worm fly" (pl~te I, fig. 3).Chrysomya macellaria Fabricius.