124 PISCATORIAL ENTOMOLOGY. 



then a mauve-coloured 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 recognised 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 

 attain full growth and dimensions immediately upon 

 quitting 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 colour 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 

 bed, and burst their " swathings." They then cast 

 their skins, like stripping off a garment, re-appearing 

 as spinners. They live about five days in this, the 

 concluding period of their life. We have several 

 times taken for experimental purposes a number of 

 Common Red Spinners, Jenny Spinners, and Great 

 Red Spinners (transformations of the Olive Dun, Iron 

 Blue Dun, and Up-winged Browns). These we have 

 deposited upon the water contained in a fish-hatching 

 box, through which ran constantly a stream of fresh 

 water, the whole being well and closely-fitted over. 

 There they have deposited their eggs, each fly dropping 



