Came across this pattern this morning in an older book. It is called the "Sure Shot".
Tail: Calf Tail
Body: Peacock Herl
Ribbing: Yellow Silk
Divided Wings: Calf Tail (I substituted white Para Post)
Hook: Mustad 7957B (I substituted TMC 100-size 14)
The author says: "This pattern was developed by Roger Nash of Denver, Colorado. It is patterned after the Wulffs and is fairly popular in some parts of Colorado."
It seems like a good floater and, perhaps, a good attractor in faster water.