140 



SANITARY ENTOMOLOGY 



stripes. Joints of legs reddish at base. Abdomen is gray and 

 in certain lights there are paler gray areas which look like 

 spots but there are never any definitely outlined spots. Mouth- 

 parts suctorial type (fig. 10a). Another stable fly (plate III, 

 fig. 2). Muscina stabulans Linnaeus. 



II. Bluish, or greenish flies. 



1. Large blue fly, with grayish thorax (average length three-eighths 

 to seven-sixteenths of an inch). This fly is rather broad and 

 robust and in certain lights the abdomen shows paler, reflecting 

 areas but not definite spots. Mouth-parts suctorial type (fig. 

 10a). The common blow fly. Lower part of head (cheeks) red- 

 dish and the beard black. Calliphora erythrocephnla ]Meigen. 



2. A slightly larger fly than the preceding but more shiny and a 

 deep greenish blue. Abdomen slightly more pointed and of an 



House Fly 



MuSC/l OOMESTte/lL 



Little Hous£ Fly St/ibL£ Tly 



f^NNI/l CANIZUL/IKIJ. L ^TOMOKYS CALCITR/tNS. 



Fig. 12. — Abdominal markings of three common house flies: a, the house fly, Musca 

 domestica; b, little house fly, Fannia canicidaris; c, stable fly, Stomoxys calcitrant. 

 (Greene.) In these diagrams the relative size of the abdomen is shown. The 

 light areas in a and h represent yellow markings and are variable in size. In fig. 

 c the markings of the last segment may be present or absent. 



4. 



5. 



even coloration (no reflecting spots). Mouth-parts suctorial type 

 (fig. 10a). Lower part of head black and the beard red. An- 

 other blow-fly (plate I, fig. 1). Calliphora vomit oria Linnaeus. 

 Much smaller fly, shiny green with a decided whitish bloom on 

 the thorax and abdomen. Mouth-parts suctorial (fig. 10a). A 

 green bottle fly. Lucilia sericata Meigcn. 



A slightly smaller fly, shiny, metallic green with a decided bluish 

 tinge and no white bloom. Mouth-parts suctorial (fig. 10a). 

 Green bottle fly (plate I, fig. 2). Lucilia caesar Linnaeus. 



A dark green fly, little larger than the above species. It is shiny 

 with bluish tinge. Top of thorax with three dark longitudinal 

 stripes. Thorax often has a bronze tinge. (Average length five- 

 sixteenths to three-eighths of an inch.) Mouth-parts of the suc- 

 torial type (fig. 10a). The "screw-worm fly" (plate I, fig. 3). 



Chrysomya macellaria Fabricius. 



