CHAPTER VI 



PERLIMJ 



IMITATION Perlidae, or Stone-flies, are 

 more used in the North in wet-fly fishing 

 than by the dry-fly fisherman of the South. 



The best known species is the Stone-fly 

 proper, but this fly does not seem to abound 

 in the South, though I have found isolated 

 specimens at Heathfield in Sussex on two 

 occasions. 



This fly is therefore omitted, and the 

 Willow-fly and the Yellow-Sally only are 

 described. 



Perlidae, unlike Diptera, have four wings. 

 As, however, the anterior wings cover the 

 posterior when at rest, it is as a rule only 

 necessary to make the imitation with one 

 pair of wings. 



This posterior pair of wings in the Perlidse 



