30 TWO-WINGED FLIES— DIPTERA . 



No. 15 is one of the " Black Cusses " (Hilaria), 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 (Empidcz), 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 (Bibio 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 



