I got this from a FB fly tying page. The pattern was tied by a skilled swedish tyer named Daniel Smith. My version is nowhere near as nice as his,but here it is anyway. His intention is for this pattern to imitate the emergers of the larger mayflies in Scandinavia. This fly will float in the surface because of the cdc wing casing. The spun thorax of rabbit or other fur will create enough life to mimic the hatch.