The Stimulator is an excellent high profile stonefly imitation and searching pattern.
Rubber Legged Stimulator
BEYC #669 - Bored Eye Yawn Club
Stimulator Flies Fly Fishing
Stimulator Attractor Dry Fly
Stoneflies & Stimulator: excellent dry fly patterns
Stimulator - Dry Fly - Umpqua Feather Merchants
Slattery's OD Stimulator - RiverKeeper Flies
Attractor Stonefly Pattern / Stimulator Fly - The Fly Crate
Attractor Flies Versus an Exact Imitation - Randall Kauffman
Stimulator Fly Step-by-Step Tying Guide and Tips
Stimulator Fly Step-by-Step Tying Guide and Tips
Attractor Dry Flies at The Fly Shop
Stimulator Fly Step-by-Step Tying Guide and Tips