Case Brown/olive hare's ear dubbing (spun rope, back 60%)
Case rib Copper wire (one strand)
Body/larva Bright caddis green Sparkle Braid or dubbing (front 25%)
Legs Brown partridge or hen (one small tuft)
Head Black dubbing or thread (collar behind bead)
How to tie it
Slide the black tungsten bead to the eye, mount the hook, and lock in 6-8 turns of lead-free wire behind the bead to sink it fast; start thread and jam the wraps against the bead.
Catch in the copper wire at the bend, then build a shaggy hare's-ear dubbing rope and wrap it forward over the back 60% of the shank to form the bulky, buggy case.
Counter-wrap the copper rib forward in 4-5 open turns and pick out the guard hairs so the case looks like glued grit and twigs, not smooth dubbing.
Tie in the caddis-green braid or dub a slim green segment over the next 25% to show the soft larva poking from its case, the trigger fish key on.
Sweep a small partridge tuft under the throat for legs, keeping it no longer than the hook gap.
Dub a tight black collar behind the bead, whip finish against the bead, and snip.