86 FLIES FOR APRIL. 



No. 17. THE JENNY SPINNER. 



This is the name given to the Iron Blue (No. 

 16) in his new dress, and it lives four or five 

 days after the metamorphosis, sporting in the 

 still summer atmosphere. The Iron Blue must 

 be coming out of its nympha 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. 1 

 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 light dun hackle. 



WINGS AND LEGS are best imitated by making 



1 A little dark dun 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 metamorphosis 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 numerous, 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, becomes spangled with seem- 

 ingly white spots. The tail increases to quite four times its original 

 length when this change takes place. 



