When the time comes for this larva to pupate it draws itself into the case and seals the top. It then undergoes metamorphosis and emerges as the pupa. Trout feed on these cased caddis just as readily as they do the web-spinning larvae. If you catch an early spring trout, especially in a river or stream, you can usually feel and hear the gravel in its stomach from the cases when you pick it up if you cradle it in your hand. Tie in the lead if you plan to weight the fly .
T ie in the silver chenille .
Dub onto the chenille strands of mohair. Tie off and trim excess . Tie in the green wool. Wrap to the head. Tie off and trim excess .