I want to share a Dave Whitlock quote from Dave Whitlock’s Guide to Aquatic Trout Foods;
“Far less than 10 percent of all fly fishers have enough working knowledge of this insect [mayflies] to identify, match and fish it successfully when trout are feeding on its various life stages.” Whitlock then warns; “This is because all aspects of fly fishing have traditionally suffered from far too much complication spawned by “experts” using their hard-earned knowledge to bewilder and discourage (if unconsciously) the newcomer. Unpronounceable Latin…confusing biological terms and irrelevant facts from chemistry and biology turned me…off to the simple, beautiful and basic facts about playing fly-fishing’s finest game to recognize, match and fish trout foods as close to nature as our artificial means and personal abilities allow”. http://www.ffotw.com/blog/?p=32
SwittersB & Exploring 
This is a very cool pattern. I recently tied a similar fly using only olive dun thread for the body and mallard flank for the wings and tail. I caught a nice brown on it fishing the arkansas river in Colorado around 2 weeks ago while on a float trip. Unfortunately I lost the fly on a tree branch after I caught that first fish with it. I found your pattern after doing a search for bwo emerger to find some new ideas.
Thanks for sharing.
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