I tied this based on a combination of the recipe given for Pete Hidy's "Stone Fly" in the T. Donald Overfield book "Famous Flies and their Originators" and a scan provided by Lance (Gingerdun) Hidy of a fly found in his father's vintage fly wallet. It looks as though it may have been intended to imitate the salmonfly that both Western trout and flyfishers cherish.
Hook: Mustad 94831, Size #12
Thread: Pearsall's Gossamer #19, hot orange
Head hackle: Dark cream hen
Ribbing hackle: Dark honey hen
Body: Blend of 80% orange wool/18% yellow wool/2% hare's poll spun on Clark block with hot orange thread
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Some of the same morons who throw their trash around in National parks also vote. That alone would explain the state of American politics. ~ John Gierach, "Still Life with Brook Trout"