DIPTERA 65 



Though when at rest the wings are flat 

 upon each other, as shown in the illustra- 

 tion of the natural fly in Plate I., they 

 often, when the fly falls on the water, are 

 spread out slightly ; so in the imitation it 

 is best to put them in the position shown 

 in the illustration of the artificial fly. 



Body. Yellow or greenish yellow chenille 

 ribbed with gold tinsel. 



Hackle. Ginger. 



Wings. Light land-rail, or brownish 

 starling. 



Hook. 2, new size. 



BLACK GNAT (Bibio johannis, Linn.) 



The black Gnat is found on almost all 

 waters. It is extremely numerous in some 

 places, and is taken very readily by the 

 trout. 



These flies are not really Gnats ; but as 

 they are commonly called Gnats by the 

 fishermen, I have kept to the old name. 



Bibio johannis comes out in June. The 

 body is black in both the male and female, 

 the wings in the male are almost colour- 

 less, while the wings of the female are 

 dark. The head of the male is also larger 



F 



