In the 1880's a New York railroad worker called Daniel Cahill developed a fly that became famous all over America, the Light Cahill. It is a great general imitation of summer mayfly duns. t was originally designed to imitate a family of mayflies with the name of Stenonema. They begin hatching in late May and continue through June.
HOOK: TFS 100, sizes 14-18
THREAD: MFC 8/0 Tying Thread, cream
BODY: Super-Fine Dry Fly Dubbing, light cahill
WING: Lemon Wood Duck
HACKLE: Dry Fly Hackle, light ginger
TAIL: Dry Fly Hackle, light ginger