The "Korn's Spent Wing Caddis", pictured here and at the top of this blog, got a nice plug on "The Fly Fishing in Yellowstone National Park" blog about half way down the page. I tie this fly for Parks' Fly Shop in tan and olive, there it's called: "Doug's Drowned Pheasant Caddis". See the plug here: http://flyfishyellowstone.blogspot.com/2010/04/gentility-now.html This caddis pattern is a great guide fly, if it's fished properly. I fish it as a trailing fly tied about 12-18 inches behind a dry fly, like an X-Caddis or a hopper. Do not put any floatant on it! When it hits the water it floats for a bit on top, then sinks in the film, then slightly under the film, then bam - fish on! Really, this is my go to fly and it works just as well in the East or West. If you are interested in tying the fly a materials list and tying steps are here: Hook: MFCo. #7000 Dry 14-18 Thread: Serafil 200 Rib: tag end of thread Abdomen: DK#12 Caddis