64 OLD FLIES IN NEW DRESSES 



Cow-DuNG FLY. (Scatophaga Stercoraria, 

 Linn.) 



This fly appears as a rule in February, 

 but I have seen it on warm days in 

 January, in fairly large numbers. It lasts 

 all the year till the frosts set in. Those 

 cow-dungs which appear early in the year 

 are not so large as those which appear 

 later. The body is covered with short 

 hairs which gives it a velvety appear- 

 ance. The thorax is large and also has 

 a number of hairs upon it. In order to 

 imitate this large thorax, it is necessary 

 to have more room on the hook above 

 the hackle and wings than in other flies 

 to leave room for a turn of the chenille, 

 of which the body is made, just below 

 the head of the fly. This will be seen 

 in the illustrations of the artificial fly on 

 Plate II. 



The body of the male is a bright yellow 

 colour, that of the female is greenish. The 

 male is rather larger than the female. 

 These flies, which on windy days particu- 

 larly, frequently fall on the water, are 

 often taken very freely by the trout. 



