Split Case Mayfly Nymph

The Split Case Mayfly Nymph, developed by Joe Mitchell of Heber City, Utah, is a highly effective pattern designed to imitate mayfly nymphs during their emergence. The distinctive split wing case, often crafted with black goose biots and a contrasting foam wing bud, mimics the natural splitting of the wing case as the nymph prepares to hatch—a visual trigger that entices trout.

Tie behind a dry fly about 1/2 the depth of the water to keep the emerger higher in the column and more natural. A Parachute Adams works well for the Dry Fly.