FLIES. 355 



bristle of the antenna is feathered to the tip (Plate 



43, Fig. 6 c) ; the abdomen has bristles strongly 

 developed on the dorsal side. 



D. Family Muscidse. The bristle of the antenna 

 is feathered to the tip; the abdomen is without 

 bristles except at the tip. Ex. : house flies, blow 

 flies, etc. 



E. Family Anthomyidse differs from the other 

 calyptrate families in that the cell of the wing 

 marked ''a" is open (Plate 44, Fig. 5 a), whereas in 

 the other calyptrate mnscids it is closed (see Plate 



44, Fig. 6 a). Ex.: the common beach fly. 



