Cool fly from Tim King; pretty simple tie. Fish it as a caddis or mayfly emerger, or just to pound them up.
hook - Dai Riki 280 #12
thread - Danville 6/0 black
abdomen - opalescent mylar medium
wing - bleached elk
thorax - peacock herl
hackle - brown
Part 1
Mash down barb; wrap thread back about gap width from the eye
tie in mylar, wrap halfway down the bend and back to where you started; tie off and trim
clean, stack, measure (tips to the hook bend) a clump of elk; tie in, trim butts
tie in some peacock herl