This is a great pattern from North America for fishing heavy tail water or in floods. It also has its uses as a pin fry imitation on both rivers and still waters.
Hook: Kamesan B400 or 175 or similar in sizes 12 through to 8’s
Silk: Black 8/0
Bead: In proportion to the hook. I have used a 3mm silver tungsten bead for a size 10 hook.
Tail: Pheasant tail fibres
Rib: silver wire
Body: Blue Krystal mirror flash wrapped as a body.
Legs/hackle: Black hen tied flat over the thorax
Thorax: Peacock herl
Shell back: 4 strands of the body material tied over.