STONE-FLIES. 75 



men. It lurks among stones till its wings be fully 

 grown and it assumes the form of a perfect fly. 



In this last state the stone-fly has a thick body, 

 of about an inch in length, of a brown colour, with 

 yellow markings underneath. It has four wings, 

 which lie flat on the back, the two upper ones of a 

 speckled grey, reticulated with darker coloured veins, 

 folding back over the lower ones. It greatly resembles 

 a moth, but its wings are not covered with the fine 

 scales that give a powdery appearance to the lepi- 

 dopterous tribe of insects. The cadis-flies are ranked 

 in the order Trichoptera, and Mr. M'Lachlan, at a late 

 meeting of the Entomological Society, described 124 

 British species, arranged in 43 genera. As an artificial 

 fly the wings are formed by the matted feather of a 

 hen pheasant. The body may be of almost any kind 

 of a dark brown fur mixed with yellow camlet or 

 mohair, so as to show the most yellow near the tail 

 and belly of the fly. A grizzled hackle wrapped 

 round under the wings affords a good imitation of 

 the natural insect's legs. Two hairs from the whis- 

 kers of a black cat may be employed to represent the 

 antennae, but, considering the gut itself quite sufficient, 

 the writer never uses them. The stone-fly has no 

 whisk or caudal termination, as is erroneously de- 

 picted in Pionald's fly-Fisher's Entomology, and in 

 the edition of Walton's Complete Angler edited by 

 Ephemera. 



