Traditional parachute pattern to imitate the small olive colored mayflies.
By using superfine dubbing in the body and a good hackle, this imitation will do the job in most cases
Hook : Ahrex FW502 Dry Fly Light #14-20
Tying Thread : Semperfli Classic Waxed thread 18/0, Olive Dun
Tail : Fibetts, Blue Dun or Grey (4 pcs)
Body : Semperfli Superfine Dubbing, Pale Olive
Ribbing : Crystal Flash
Wing : Cdc, Blue Dun
Thorax : Semperfli Superfine Dubbing, Pale Olive
Hackle : Whiting, Blue Dun
You can easily change the fibetts in the tail with Coq De Leon fibres or hackle fibres. Many fly tyers and fishermen prefers that before fibetts.
See how to tye in the cdc wing here : Cdc Mayfly Wing