76 THE EPHEMERID.E 



the shoulder in vertical planes above the body, gene- 

 rally touching each other as they rise from the body, 

 and when floating down-stream these delicate insects 

 can easily be recognized : their wings are like the sails 

 of a fairy yacht afloat on some dreamland sea. 



THE TRICHOPTERA AND THE SIALID^E (THE ALDER). 

 The wings run backward from the shoulder, and lie 

 alongside the body, meeting, tent-shaped, at their upper 

 edges, and gradually diverging in the posterior direction. 



THE PERLIDJE. The wings are placed in a flat posi- 

 tion, running backward from the shoulder in horizontal 

 planes, and crossing or overlapping one another over 

 the body. 



THE DIPTERA. The wings generally, like the Per- 

 lidse, are placed in horizontal planes ; in most cases 

 they do not overlap, but diverge from one another, as 

 in the common bluebottle. 



There are over 200 different species of water beetle, 

 the numerous family of the Notonectidse, besides the 

 larvae of the above flies, etc., upon all of which trout 

 exist ; and, therefore, the wet fly fisherman may well 

 imitate other forms of sub-aqueous life, apart from the 

 larval, the pupal, or other conditions of such flies. Of 

 such lures " Corixa " and the fresh- water shrimp are 

 perhaps the best. 



THE EPHEMERID^E 



The sub-aqueous existence of one of the Ephemeridse 

 occupies the greater portion of its life. From the period 

 at which it leaves its egg until it becomes a flying insect 



