Tail / gills Tan or gold ostrich herl (3-4 fibers)
Lead-free wire underbody Silver lead free wire (8-10 turns)
Abdomen dubbing Amber/golden Hexagenia (1 pinch)
Gill fringe Tan ostrich herl or marabou (1 strand)
Flashback / wing case Pearl mylar (1 strip)
Thorax dubbing Amber dubbing (1 pinch)
Legs Brown partridge (1 feather)
How to tie it
Slide the bead to the eye if using, then lay a wire underbody over the front 60% of the shank to give the nymph its weight and burrowing sink rate; bind it and start thread behind it.
At the bend tie in a sparse clump of ostrich herl tips one gap length long for the tail; keep it wispy, this is a soft gilled nymph not a stiff one.
Tie in a strand of ostrich herl and a strip of pearl mylar at the bend, leaving both hanging to the rear.
Dub a slim tapered abdomen forward to the 65% mark, keeping it half as thick as you think, then palmer the ostrich herl forward over it in 5-6 open turns to suggest gills and tie off.
Pull the pearl mylar over the top as a flashback to the 65% mark and bind it, leaving the tag to become the wing case.
Dub a fatter thorax forward to just behind the bead, stopping short so you have room to finish.
Sweep a partridge feather's fibers to each side as legs and bind, then pull the mylar tag over the thorax as a wing case and lock it down.
Whip finish behind the bead, snip, and add a drop of head cement.