In his book “Flies of Ireland“, Peter O’Reilly attributes this fly to Cyril Conlon. It’s a fantastic choice for the duckfly hatch but don’t think you can’t use it further afield it’s great for dark buzzers more generally. I find fishing 2 of them on the droppers with a hedgehog or mini-muddler on the point to keep the team high in the water column to be deadly when the fish are looking up.
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Materials list
Hook: Kamasan B160 size 10-14
Thread: Black Uni 8/0
Tag: Flat silver tinsel*
Rib: Silver wire
Wings: White hackle tip
Thorax: Red or Orange sealfur
Hackle: Sparse black hen
*Fly can be tied without the tag, in which case take the thread body round the bend.