This pattern featured in George Daniel's book Dynamic Nymphing.
It looks very close to the natural and has been very productive for me on my last two trips to Montana's Bighorn River. For a realistic pattern, it is very easy to tie.
Hook: C200bl Size 14-16
Weight: Lead Wire
Thread: 140 Denier Ultra Thread
Body/Legs: UV Micro Polar Chenille
Back: Clear Cure Goo