This is a relatively plain pattern which, according to Roger Fogg, first appeared in Michael Theakston's 1853 book,
British Angling Flies. It apparently was dressed in both winged and hackled versions, with the hackle feathers coming from various locations on both grouse and domestic hens.
Hook: Size 14-12 (Daiichi 1530, #14)
Thread: Brown tying silk (Pearsall's Gossamer #17)
Hackle: Any small dark feather from a grouse or dark brown hen (upper covert from a red grouse wing)
Body: Well-waxed brown tying silk

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"