Hook:

16 - 20 Tiemco 100 or other standard TDE dry fly

Thread:

8/0 Uni-Thread Primrose or Pale Yellow

Wing:

Medium Dun polypropylene yarn clipped to leave a wing butt and pitched forward 45 degrees

Tail:

Mayfly Brown straight zelon

Body:

Dirty Sulfur Yellow Beaver

Hackle:

Ginger clipped on the bottom - flush with hook point

Another nice imitation of a Sulfur mayfly.  Try this guy when the trouts get wise to the Dun