Don, I'm surprised some of our Irish friends haven't jumped on this one.
The duck fly is the name for a large chironomid(s) in Ireland. I suspect
it got its name because the ducks feed heavily on it. There are several
patterns with the name; Malone in Irish Trout and Salmon Flies gives 3
patterns for the adult (black, olive, and brown) and one for the
"nymph." Cheers,
Paul
-- 
Paul Marriner
Outdoor Writing & Photography. Member OWAA & OWC. Author of Stillwater
Fly Fishing - Tools & Tactics (CD), Modern Atlantic Salmon Flies,
Miramichi River Journal, Ausable River Journal, and Atlantic Salmon.

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