Attributed to Doug Prince; shares some components with the Forked-Tail Nymph and the fly that bears his name. Tied here with a bead head; could be swapped out for a weighted underbody version.
hook - Dai Riki 280 #8
thread - Danville 6/0 black
tail - Amherst pheasant tippet
body - black ostrich/green Uni-Stretch band
hackle - hen black
wing - goose biots white
bead - 4mm black
Part 1
mash barb, slide bead on hook, take a few wraps of non-tox and jam it in the backside, start thread, wrap to bend
trim out center of AP tippet; fold, measure (gap width past bend), tie in
tie in some ostrich, twist with thread, wrap rear 1/3; tie off/trim
tie in Uni-stretch, wrap middle 1/3; tie off/trim