120 PISCATORIAL ENTOMOLOGY. 



fungus, 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 the multiplicity of 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 nymphae 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 Yellow 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 termi- 

 nate, and a comprehensive glance may be given of 

 them in an order of rotation as the season progresses. 



The nympha of the Pale Evening Dun rises from 

 deep still water, the colour very much resembling the 



