Ill 



next, the surface is covered as far as the eye can 

 reach with myriads of this dingy-brown insect. 

 Presently they are all gone and, perhaps, in an 

 hour or so, a fresh hatch takes place. 



The Ecdyurus species is less erratic and gener- 

 ally, there is a steady dribbling hatch, from mid- 



By permis8ion of ANNALS AND MAGAZINE OP NATURAL HISTOR 

 Fig. 2. Ecdyurus venosus 



May onwards through the season even up to 

 October, if weather conditions should be favour- 

 able. No great number is present on the water 

 at any particular time. 



These habits may perhaps furnish the fisherman 

 with the easiest method of distinguishing the two 

 species, should he wish to do so. Such a dis- 

 tinction, excepting for purposes of accuracy, is 



