Anyhow, while going through some of my fly storage boxes looking for some that need to be refilled, I came across one labelled "Isosplymph" that had three interesting flies in it. I checked back on the forum to confirm that I hadn't posted this pattern previously and decided to share it. The color combination was chosen to suggest an Isonychia (slate drake) mayfly, hence the name.
Hook: Mustad 94842, Size #14
Thread: Pearsall's Gossamer #14, claret
Hackle: Badger hen saddle
Tail: Two very light dun hackle fibers
Body: Two "grey goose" flight feather barbs twisted with thread tag and wound forward in close palmer wraps
