104 THE SCIENTIFIC ANGLER. 



Cock-winged Dun. By the beginning of April it is of a 

 general olive color, with yellow-ribbed body, upon which 

 rests a bloom, like that of a ripe muscat grape, but upon 

 dull days a rust-like fungus is substituted for this, which 

 gives a ruddy appearance to the whole body at first sight. 

 It is then known as the Yellow Dun of April, light and 

 dark. In April, in the cold water near the springs or 

 sources of streams, more especially in limestone districts, 

 the fly appears of a light blue tint. This is designated 

 the Pale Blue Dun. A few weeks later again, and the 

 Blue Dun of February appears as the Yellow Dun of 

 May, and in ungenial weather, as the Hare's Ear Dun. 

 This, like most of these multifarious appellations, takes 

 its name from a part of the material used in the con- 

 struction of the artificial, the former being a light and 

 delicate olive, the latter several shades darker. 



The "Yellow Dun of May" continues plentiful 

 through June on hot days, the action of the sun rendering 

 it lighter on the body. In July it is designated the Pale 

 Evening White, it being as white as a new shilling. The 

 nympha3 locating in shallow open water, where the sun's 

 rays penetrate during the hot months, the fly appears 

 excessively light and delicate. In June, unseasonable 

 weather causes the body of the dun to assume a dirty 

 yellow tinge, and it is then known as the Common Yel- 

 low Dun. It acquires a more pronounced yellow a little 

 later, when the fly is termed the Golden Dun, being more 

 partial to fine weather. There are still two other shades 

 before the gradual tints of this interesting fly terminate, 

 and a comprehensive glance may be given of them in the 

 order of rotation as the season progresses. 



The nympha of the Pale Evening Dun rises from deep 

 still water, the color very much resembling the common 

 yellow shade of June. This, in common with all water 

 flies, gradually assumes a lighter shade, even when ex- 

 posed to the sun's rays for only an hour. Dull or inclem- 



