FLIES FOR APRIL. 71 



No. 16. IRON BLUE DUN. 



After emerging from its water nympha, this fly 

 remains about two days in the state shewn, and 

 then changes to the Jenny Spinner, (see No. 17). 

 It is one of the smallest flies worth the Angler's 



o 



notice, but not the least useful. The male has a 

 brownish red crown or cap on his head. The fe- 

 male is also crowned, but her cap is too small to 

 be easily seen. It is in season from the latter end 

 of April until the middle of June, and is on the 

 water chiefly on cold days ; influenced by effects 

 similar to those which act upon the Blue Dun, 

 (see No. 2). IMITATION . 



BODY. Blue fur from a mole. Reddish brown 

 floss silk may be tied on for the head. 



TAIL. A whisk or two out of a yellow dun 

 hackle. 



WINGS. From a feather of the under side of the 

 cormorant's wing ; or in default 

 thereof, a feather from the breast of 

 the water hen ; the tip of which must 

 be used. Or the upper end of the 

 wing feather of a tomtit when in full 

 plumage. 



LEGS. A very small yellow dun hackle. 



It is difficult to find a hackle feather of the tint 

 proper to make this fly buzz. 



