Randall Kaufmann introduced the Orange Stimulator pattern in 1982 to imitate Salmonflies. The Stimulator also makes a good hopper pattern.
Kaufmann finds that the pattern is often overdressed by other tiers. He recommends a hairwing and tail that is sparse, yet flared, to achieve the appearance of bulk. This will help stabilize the fly on the water surface.
HOOK: TFS 200R, size 6-10
THREAD: MFC 6/0 Tying Thread, orange
HEAD: Super-Fine Dry Fly Dubbing, yellow - Dry Fly Hackle, grizzly
BODY: Super-Fine Dry Fly Dubbing, orange - with palmered Dry Fly Hackle, brown
RIB: Brassie Ultra Fly Tying Wire, gold
WING: Elk Body Hair
TAIL: Elk Body Hair