Silvius Demon
Steelhead Fly
Lloyd Silvius of Eureka, California, originated this pattern in the 1930s for the Eel River.
Hooks - TMC7999, DA12441 or equivalent
Thread - Black
Tail - Yellow hackle barbs
Butt - Red chenille
Body - Oval gold tinsel
Hackle - Orange tied on as a collar and tied back and down
Wing - Dyed black squirrel tail tied over the body
Fish Flies: The Encyclopedia of the Fly Tier’s Art - Terry Hellekson
Any similarity to a previously known published fly pattern is purely coincidental