Tie in a bunch of wood-duck flank fibers as an upright wing about one-third back from the eye, then divide and post them into two Catskill-style wings.
Tie in several brown hackle fibers for a tail one shank length long, keeping a bit of bare shank behind the eye per Catskill style.
Dub a slim, evenly tapered fawn rabbit-fur body from the bend up to the wing.
Tie in one brown and one grizzly hackle behind the wing by their stems.
Wind both hackles together, a couple of turns behind and a couple in front of the wing, keeping the fly sparse and well proportioned, then tie off.