I frankly never remember to tie these patterns. How simple while churning out dozens of Elk Hair Caddis (EHC) to simply tie the Hairwing Dun. Whether, the tail is a traditional split tail of hackle fibers or as I tied it with Zelon/Antron fibers, the pattern does well as a mayfly dry pattern (and a caddis too).
These were tied on a size 14 hook. The thread was tan 8/0. The tail was tan Zelon and the dubbing was a tan synthetic by Hareline Dubbin. The dubbing was twisted onto the thread and wrapped up the shank to satisfy the abdomen and thorax. Tan elk hair was cut from the hide, evened out in a hair stacker and tied in as a wing. Simple as that. No rib. A basic EHC wing for a mayfly pattern. This pattern satisfies the mayfly emerger/adult pattern needs.
Notice the identical wing for the EHC and the Hairwing Dun. Below is a Hairwing Dun tied with a traditional hackle barb tail I found at Smoky Mountain Fly Fishing. I must note what I took to be a nice experimental effort on my part has the same look as the famous Matthews X-Caddis…hmm…the complications of thinking you are original and realizing, as you would expect, others have been there..done that..and called it something else. Oh well..the wing is the issue here. The tail I have used conflicts with the renowned X-Caddis pattern. What can I say…it works for both.