xiv INTRODUCTION 



Kenneth J. Morton, who has devoted years of 

 a busy life to the study of many Orders and 

 Families with which the trout fisherman has to 

 deal, and who has never grudged the time spent 

 in replying to my many letters, nor the careful 

 attention required for the identification of such 

 insects as I have sent him, and who has further- 

 more added to his many kindnesses by carefully 

 examining and, where necessary, correcting all 

 the drawings of genitalia appearing in these 

 pages ; to the Rev. A. E. Eaton, who is the 

 authority the world over on the EPHEMERID.E, 

 and whose ready help has been as invaluable to 

 me as it -was to Mr. Halford in bygone days ; 

 to Mr. Hugh T. Sheringham, who at once 

 acceded to my request to devote some of his 

 busy hours to the reading of my MS. ; and, 

 finally, to those members of the angling public 

 who have so readily responded to my frequent 

 requests, published in the angling press, for 

 insects which frequent streams with which I 

 am unacquainted. 



MARTIN E. MOSELY. 



21 ALEXANDRA COURT, 

 QUEEN'S GATE, S.W. 



