The Killer Mayfly Nymph is a great pattern as a dropper below a heavier nymph pattern. If you have picky fish, the realistic profile of this pattern works extremely well. It works on just about every trout stream, from the Bighorn River to Rapid Creek. Tie it in sizes 16-22.

Materials

Hook: Daiichi 1270 

Thread: 70 Denier Black or Olive

Tail: Microfibbets

Abdomen: Micro Tubing or D-Rib

Wing Case: Medallion Sheeting

Thorax: UV Ice Dubing

Legs: Brahma, India Hen, or Partridge