PERLID^ 55 



often materially changes the colour of the 

 anterior pair when they are at rest. Thus 

 in the Willow-fly, though the anterior pair 

 of wings are of a brownish colour, they 

 appear of a dark slaty hue when the fly is 

 seen crawling about. An illustration of 

 natural fly is given on Plate I. 



WILLOW-FLY (Leuctra geniculata, Steph.) 



This fly comes on late in the season. In 

 September and October it is taken freely 

 by the trout and grayling. It is similar in 

 shape to the Stone-fly of the North. 



This fly has almost always been made 

 buzz. Ronalds mentions in his Fly Fisher's 

 Entomology that it may be made with wings, 

 but does not say anything about their 

 position. I do not think that the hackle fly 

 is a really good imitation of the natural 

 insect, and it is quite possible to put the 

 wings of the imitation in the same position 

 as those of the natural fly. 



It will be seen that there are on Plate II. 

 three illustrations of the imitation Willow- 

 fly. One of these has its wings in the 

 position of rest, the manner of dressing 



