Black Beauty

The Black Beauty is a legendary midge pattern developed by Pat Dorsey of Colorado for the tailwaters of the South Platte River—especially the Cheesman Canyon and Deckers stretches. Designed in the 1990s to imitate tiny midges that dominate the winter and early spring food supply, the pattern was built for difficult, low-water conditions where trout feed on small bugs with surgical precision.

It's a great fly for the Trico Mayfly as well