PISCATORIAL ENTOMOLOGY. 107 



the weather This fly diminishes iD size as the weather 

 grows warmer. By August the fly is still a little smaller, 

 and is known as the August Brown or Dun. These are 

 seldom numerous, the nympha being generally in a state 

 of torpor in the hot months, as it is a hardy insect, and 

 partial to rough weather. A few Up- winged Browns 

 continue to haunt the surface of rivers and streams for 

 the remainder of the season, but are seldom sufficiently 

 numerous to merit attention. 



The Iron Blue Dun ranks next in importance to the 

 Up-winged Browns. This is a distinct species, and is 

 not to be confounded with the Olive Dun, which is 

 double the size. The general prevailing color of this 

 insect is a beautiful deep blue, except upon the body, 

 where there is a faint tinge of mauve, intermingled with 

 blue. 



It makes its first appearance in April; in May, however, 

 it is infinitely more plentiful, but has then a mauve-color- 

 ed body, acquiring a lighter hue as the season advances, 

 precisely similar to the other duns. The fly appears in 

 June and July, but paler in wings and body, when it is 

 recognized as the Little Sky Blue; and in the early part 

 of September is called the Little Pale Blue. Later still 

 it is very plentiful, but darker in shade, until in October 

 it closely resembles the olive shade of the Duns in April; 

 indeed these are frequently taken for half -matured Olive 

 Duns ; but this cannot be, as all winged water insects at- 

 tain full growth and dimensions immediately upon quit- 

 ting the pupa case. The metamorphosis of this fly is 

 the Jenny (or Jinney) Spinner. This is a beautiful and 

 delicate fly, so delicate that it is a difficult matter to 

 copy it successfully. The color is pure milk-white upon 

 legs, wings and body, except a bright crimson band at 

 each extremity of the last-named. 



Each of the three varieties of up-winged water flies 

 live three days, after having ascended from the river's 



