Here are two versions of Morgan’s Chironomid Emerger. I can see that this pattern could be modified to replicate a BWO as well. The fly is also tied with foam post/parachute style but the CDC and the flashy shuck are a constant in the original pattern. 
I posted this fly because I receive numerous queries for this pattern, so it must be important or in a magazine or site somewhere. Not sure of the origins but upon research I see past articles out of the Dakota’s.
SwittersB & Exploring 
I saw this post and thought I would weigh in. It is correct that the fly was developed by Craig Morgan(namesake) and myself, Eric Larsen to solve the challenge of picky fish eating single, adult midges. There is an article in Fly Fisherman, written by Craig Morgan that details the development of both the standard and para Morgans Midge.
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I actually hadn’t seen Craig’s post which is much more detailed, you may want to edit mine out if you like? I guess I would add that it appeared in Field and Stream last year as a top 10 “New Patterns” article.
Eric Larsen
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The Morgans Midge was created by me, Craig Morgan, and my friend Eric Larsen. Developed on the Green and Provo River in Utah back before krystal flash came in multiple colors and CDC had to be obtained by shooting the ducks or geese. They are still my favorite surface midge patterns. They are sold commercially by Umpqua. I like the standard pattern more than the parachute.
Most important, match the shuck color to the naturals. Also match to underside of the body color. I almost always use iron dun colored thread for the head.
Thanks,
Craig
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Very nice!!
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