Hook: Your favorite nymph hook in stonefly sizes
Thread: Yellow or Gold
Weight: Lead wire or equivalent
Tail: Pheasant tail fibers
Over Body case: Mallard flank
Abdomen: Stripped brown hackle stem
Thorax: Yellowish dubbing
Legs: Hungarian partridge or equivalent
The above fly is just one color and as the tyer you can tie them in whatever color of stonefly that inhabits your area streams
NOTE: this is one version of this fly. there are other version with the same name, slightly different materials.
be creative. think about it. experiment.