Tied here as a hydropsyche; change color/size to suit your needs. Bead head is optional for weighting.
hook - Unknown (Daiichi 1140 or 1150?) #16
thread - Danville 6/0 brown
underbody - non-tox .015
rib - x-small wire gold
abdomen - Zelon dubbing hydropsyche
shuck/shellback - marabou brown
hackle - partridge
antennae - woodduck flank
head - dubbing brown
Part 1
mash barb, wrap non-tox
start thread, tie in rib, wrap to bend
dub thread/dub abdomen to 2/3 mark (part 2 seems to have disappeared into the either)
prep marabou tip; tie in at front of abdomen
pull marabou over back, capture tip with rib, continue up the abdomen, helicopter end, cover with thread; trim tips (gap width)