Ice dub or peacock (thorax) Peacock/brown or fine dubbing (pinch)
How to tie it
Slide the bead to the eye, mount the curved hook, and start brown thread.
Tie in a few pheasant-tail fibers as a tail, about half a shank long, at the bend.
Tie in fine copper wire and a bunch of pheasant-tail fibers.
Wrap the pheasant tail forward to the 60% mark for the abdomen, then counter-rib the wire forward in 5 turns and tie off.
Build a pronounced raised thorax bump behind the bead with dubbing or thread; this hunchback profile imitates a mayfly nymph swollen with emergence gases.
Tie in a strand of pearl flash, pull it over the thorax as a flashback, and tie it off behind the bead.