This nymph imitates the pupa stage of a sedge as it ascends to the surface to hatch, so primarily a fly to use in the evening, when the trout are not preoccupied with the adults.
Hook: Size 12-16 Kamasan B100
Thread: Tan/primrose 8/0
Weight (optional): Thin lead foil
Rib: Brown Flexi-Floss
Abdomen: Fine dubbing in pale olive and amber shades
Thorax: Hare/squirrel dubbing
Thorax cover: Black Thinskin
Legs: Natural partridge
Try this low-riding Mayfly Dun for fussy trout that refuse a high-riding dry-fly.