86 FLIES FOR APRIL. 



No. IT. THE JENNY SPINNER. 



This is the name given to the Iron Blue 

 (No. 16) in his new dress, and it lives four or 

 live days after the metamorphosis, sporting in 

 the still summer atmosphere. The Iron Blue 

 must be coming out of its njanpha at the same 

 time that this fly is in season : the Iron Blue is, 

 however, found on the water chiefly on cold days, 

 from the end of April until the middle of June.^ 

 The Jenny Spinner lasts all the summer, is out 

 on mild days, particularly towards the evening, 

 and is a killing fly even when the water is ex- 

 tremely fine. 



IMITATION. 



Body. White floss silk wound round the 

 shank of the hook, &c., and tied on at the head 

 and tail with brown silk, which must be shown. 



Tail. A whisk or two of a liqht dun hackle. 



' A little dark dnn with a brown head, not exactly similar 

 to, but very much like the Iron Blue, is found in August, and 

 then a Spinner like the Jenny Spinner has an orange-coloured 

 head, and the extremity of its body a lighter colour. 



There is also upon some waters a rather smaller ephemeral 

 fly, similar in colour to the Jenny Spinner, whose metamor- 

 phosis does not change much, in tint, from the original. It is to 

 be found, in some seasons, upon the Blithe, in Staffordshire ; 

 but upon Lake Tal-y-llyr, in North "Wales, this insect is so 

 ninnerous, on warm evenings, as to form clouds, settling upon 

 the dress of a person passing by the lake (or upon any other 

 object), where, in five or ten minutes, it changes its coat, leaving 

 the old one upon the dress, &c., which, if of a dark colour, be- 

 comes spangled with seemingly white spots. The tail increases to 

 quite four times its original length when this change takes place. 



