Blue-winged Olives - Fly Pattern Colors
.............................Fly Fishing Yellowstone National Park
04/10/08

Nymph:     
Hook: 16-24
Thread: Olive
Tails: Olive Brown                 
Abdomen: Olive Brown
Thorax: Grayish Olive Brown
Tying "Perfect Mayfly Duns,
Tying "Perfect Mayfly