60 THE BROWN SILVERHORNS 



give a drawing of a portion of one of them, 

 much enlarged. It will be seen that the 

 toothed appearance is due to the presence 

 and arrangement of strong hairs arising from 

 a slight swelling towards the middle of each 

 joint (Fig. 31). 



Family . . LEPTOCERID^; 

 Genus . . Leptocems 

 Species . . cinereus 

 Spurs, 2.2.2. 



PLATE XII 



Leptocerus cinereus is the brown silverhorns 

 of the trout fisherman, and is abundant on 



FIG. 32. Genitalia of Leptocerus cinereus , 

 from the side. 



most rivers. On the Thames it occurs in 

 countless numbers, and on still summer even- 

 ings may be seen across the river from bank to 



