Seat the tungsten bead at the eye and start thread behind it, running a base to the bend.
Split two brown biots into a narrow V for tails about half a shank long at the bend.
Bind the wire at the bend and wrap it forward in tight touching turns to build a smooth, fast-sinking segmented abdomen to the 60% mark; tie off and snip.
Tie in a slip of dark Thin Skin or flash over the top pointing forward, to fold back as the wingcase.
Dub a contrasting thorax up to the bead, keeping the back darker than the belly for countershading.
Tie partridge fibers along each side as legs reaching mid-body.
Pull the wingcase over the thorax, lash behind the bead, snip the excess, whip finish, and cement.