Buy the book "Hatches II" by Al Caucci and Bob Nastasi and it will tell you what you want to know.
My two personal favorite patterns for this critter are an emerger (grey dubbing, deer hair wing) fished dead drift in the surface film in slack water and a swimmer nymph fished on the swing in the faster riffle water. The latter is pretty cool as big trout (15-24" in my experience) will clear the water chasing it. This nymph will also imitate isonychias.