THE MALE AND FEMALE 173 



is very much larger, and lighter in colour, than 

 the male fly. Both male and female are very 

 similar to the male and female March brown 

 respectively. Indeed, an artificial March brown, 

 divested of its tails, and with the addition of a 

 small tag of pea-green silk, makes an excellent 

 substitute for the grannom. This green tag 

 serves to represent the funny little bunch of green 

 eggs with which the female is provided. Hence 

 the predilection of the fish for the female fly 

 Others of the Trichoptera also thus carry their 

 eggs, and the latter are generally green or 

 yellowish green in colour. The needle brown 

 is an example of this. 



The grannom usually appears on the water 

 in April, and remains for about ten days or a 

 fortnight. Some authors mention having seen it 

 in July and August. Whether these are the true 

 grannom or not, I cannot, of course, pretend to 

 say. The authority is too good to be questioned. 

 This fly is also called the ' greentail.' 



The grannom may be thus dressed : 



MALE FLY. 



Wings : From a darkish partridge wing-feather. 

 Body : A strand of heron's wing-feather dyed 



brown, or hare's ear and mole's fur mixed. 

 Hackle : A grizzled blue dun. 



Hook o or i. 



