Hook Extra-long dry-fly hook, #18-24 (tied on a #22)
Thread White 40 denier (about 17/0, e.g. Uni)
Materials
Superfine synthetic dubbing (body) Chartreuse ice dub (A noodle just under two inches)
Duck quill slip (wing) Natural, or yellow/green/chartreuse duck quill slip (One tiny slip, coated with varnish before tying in)
Dry-fly hackle White or light ginger dry fly hackle (One feather (a size 20 on a size 22 hook), three or four turns)
Head cement Clear head cement (The tiniest drop)
How to tie it
Start the thin white thread and lay a base back to about the hook point. With thread this fine, never yank down on the bobbin to pull more out: pull it straight down instead or it will break.
Wax the thread and spin on a fairly tight chartreuse superfine noodle, just under two inches; you don't need a taper.
Put the first couple of wraps on in front of where you want the body to end, then wrap back, which keeps fuzz from hanging off the rear. Wrap the body forward, leaving bare shank in front for the hackle.
Paint a coat of varnish on a tiny duck quill slip so it holds together, then lay it flat on top of the body just behind the front of the dubbing and take a couple of loose wraps to check the position, angled back over the fly.
Take a few tight wraps to lock the wing in, then fold the wing up and cut it at an angle just past the bend of the hook, so it drops back down over the body tent style.
Tie in the white or light ginger hackle at the front with the concave side toward the hook, leaving a little bare stem showing at the tie-in point to make the first wrap easier; trim any stub.
Take three or four turns of hackle, working carefully over the step down to the bare shank and without clobbering the eye; catch the stem off.
Pull the hackle fibers back, take a few wraps, whip finish (zigzagging the thread to avoid trapping fibers), and only then trim off the excess feather.