30 TWO-WINGED FLIES— DIPTERA. 



No, 15 is one of the " Black Cusses " {Hilana), which 

 fly over the surface of the water in clouds in May, June, 

 and July. 



The Small Green Insect, fig. 16 {Pachygaster polita), 

 is first rate on a bright day, and is a sure friend under 

 difficult fine conditions. 



The Large Green Bottle, fig. 17, also does well at times, 

 particularly under bushes. 



No. 18 is the Oak Fly or Downlooker {Leptis 

 scolopacea), exceedingly plentiful everywhere in some 

 years, and again, other seasons it is almost absent; 

 April is about its season. 



Fig. 22 is the Small Oak Fly {Leptis lineola) ; it 

 is a very smart little insect, and comes on later in the 

 season than the larger variety, and we have found it 

 more successful as a pattern for imitation. It has reddish 

 legs with dark joints, well suggested by a Coch-y-bonddu 

 hackle. 



No. 19 is plentiful at the same time as the Oak Fly. It 

 is one of the Snipe Flies [Empidce), easily distinguishable 

 by the extraordinary likeness to a snipe which its head and 

 mouth present when viewed sideways. 



In almost all good books on fly fishing the Hawthorn 

 Fly {Bihio marci) is mentioned as a very excellent one to 

 use ; it is in evidence when the hawthorn trees are in 

 bloom and as it is a very old acquaintance we give a sketch 

 of it in fig. 20. 



The next (fig. 21) is an especial favourite, and quite a 

 successful imitation. It is the Silver Tail, and is on 

 when the " Black Cusses " are a nuisance, and in certain 



