This fly is called The Fisherman's Curse Ceanid. Why you may ask. When they hatch, they hatch in their billions and usually in early morning. When the adult insects fall to the waters surface, after mating, it is called a spent spinner. This fly is representing the latter part of that hatch. The frustration is so many flies in such a small size drifting. How does the fish find your pattern. Deadly accurate casting and countless casts are required. The hook size tells it all. Good luck!