Here is the fly pattern sheet for the Biot Backed Stonefly, a fly created by Devin Olsen.
Daiichi 1720, #6-10
Danville 70 denier, tan
D Rib – brown or golden stone – medium
Spirit River UV2 Caddis/Nymph dubbing – Golden Stone
Spirit River UV2 goose biots – brown
.Life Flex (Hareline code: LFX #40 brown)
Personal tying notes:
- Tungsten beads and hooks – 4.0 for #6, 4.0 for #8, 3.0 for #10.
- Original pattern called for D rib; I used Vinyl rib, medium. Consider using size small for #10.
- Consider using UV resin to cover thorax portion of biot to provide additional strength.
Here is a link to the YouTube video with Devin tying the fly: