SECOND DAT.] FLIES. 51 



has in June and July a yellow body ; and there is a 

 water-fly which in the evening is generally found 

 before the moths appear, called the red-spinner. 

 Towards the end of August, the Ephemerse appear 

 again in the middle of the day, a very pale small 

 Ephemera, which is of the same colour as that which 

 is seen in some rivers in the beginning of July. In 

 September and October this kind of fly is found with 

 an olive body, and it becomes darker in October, 

 and paler in November. There are two other flies 

 winch appear in the end of September, and continue 

 during October if the weather be mild, a large 

 yellow fly with a fleshy body and wings like a moth ; 

 and a small fly with four wings, with a dark or claret- 

 coloured body, that when it falls on the water has its 

 wings, like the great yellow fly, flat on its back. 

 This, or a claret-bodied fly very similar in character, 

 may be likewise found in March or April, on some 

 waters. In this river I have often caught many 

 large trout in April and the beginning of May with 

 the blue dun, having the yellow body; and in the 

 upper part of the stream below St. Alban's, and 

 between that and Watford, I have sometimes, even 

 as early as April, caught fish in good condition ; but 

 the true season for the Colne is the season of the 

 May-fly. The same may be said of most of the large 

 English rivers containing large trouts, and abounding 



