This is one of my winter patterns for Stoneflies. It's tied to represent a growing bug that just shed its' exoskeleton. You can find a video for this fly on the Troutfitters Youtube channel. Here are the ingredients for this pattern;
Thread:
Uni-Thread 6/0, Iron Grey
Hook:
Gamakatsu C12U sz. 6 or 8
Bead:
Spirit River 1/8" Orange Hot Bead
Tails:
Wapsi Goose Biots, Black
Rib:
Ultra-Wire Medim, Copper Brown
Flashback & Wingcase:
Mirage Flashabou, Opal Sheet
Abdomen& Thorax:
Spirit River UV2 Dubbing, Elite Enhancer Dark
Wings:
Wapsi Goose Biots, Black