252 THE DRY-FLY MAN'S HANDBOOK 



some parts of Ireland, where I believe it is called the 

 yellow hawk, it kills well, and Mr. M. E. Mosely tells 

 me that he has found it in autopsies from rivers and 

 streams in Co. Cork. The scientific names of two 

 insects to which anglers attached the name yellow 

 may dun are Heptagenia sulpkurea and H. flavipennis, 

 the difference between these two species being only 

 microscopically distinguishable. The nymph of the 

 yellow may dun is another of Pictet's larves plattes. 



The turkey brown is a fly which is plentiful on the 



chalk-streams in the spring, 



Turkey brown. and, like the last fly referred to 



herein, does not appear to be 

 taken by the trout, as in the numerous autopsies made 

 I have only found one single example of this insect. 

 It is somewhat similar in colouration to the march 

 brown, but is much smaller and besides has three caudal 

 setse, while the march brown has only two. The scien- 

 tific name of the turkey brown is Leptophlebia sub- 

 marginata. 



Another member of this family is known in Ire- 

 land as the claret dun, and is 

 Claret dun. very plentiful on some of the 



Irish loughs, notably Lough 

 Arrow. Like the turkey brown, this insect is 

 furnished with three setae. The subimago will 

 be readily distinguished by its smoky, blue-black 

 wings and the deep claret colour of the body. The 

 imago is very similar to that of the turkey brown, 

 the differences in structure being so minute that 



