The Dark Olive Barbless Hackled Dry Size 14 is an excellent, traditional dry fly for adult olive duns. Its dark olive body is particularly relevant to Large Dark Olives during spring and autumn, while the hackle supports the fly in broken river water.
Fish it upstream on a tapered leader during an olive hatch. Match size and shade to the naturals and use reach casts or careful mends to maintain a drag-free drift. This is the sort of dependable dry that can turn a quiet rise into a memorable take.