28 TWO-WINGED FLIES DIPTERA. 



No. 15 is one of the 4i black cusses" (hilaria\ which 

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

 June, and July. 



The small green insect, fig. 16 (pachygaste* 

 politct], 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. 1 8 is the oak fly or down looker (leptis 

 scolopaced], 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-bondu hackle. 



No. 19 is plentiful at the same time as the oak fly. 

 It is one of the snipe flies (empidce), easily distinguish- 

 able by the extraordinary likeness to a snipe which its 

 head and mouth present when viewed sideways. 



In almost all 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 



