This fly is a killer pattern in sizes # 18 & # 20 on the Wild Trout section of the Owens River near Bishop, CA – especially in the early spring.
Thread: Gordon Griffiths brown or olive
Hook: Diiachi 1560 or TMC 3761 # 16-20
Tail: Olive Zelon straight or kinky
Abdomen: Stalcup’s BWO goose biot
Rib: Largutan fine gold wire
Thorax: Olive ostrich herl
Wingcase/legs: Black crystal flash
I fish this pattern deep with twist–ons or higher in the water column with appropriate weight. It may also be fished just under the surface film as a trailer.