Body/sparkle sheath Antron sparkle yarn picked over the body (loose halo)
Collar Dark brown or black dubbing (small)
How to tie it
Slide a tungsten bead to the eye so the pupa sinks and rides right.
Tie in a sparse tuft of Antron sparkle yarn at the bend as a short trailing shuck.
Dub a caddis-green underbody over the back two-thirds of the shank.
Distribute Antron sparkle fibers loosely all around the body and pick them out into a translucent halo, this imitates the shimmering gas bubble of an emerging caddis pupa (Gary LaFontaine's key insight, which Joe Goodspeed 'evolved').
Dub a small dark brown or black collar behind the bead to suggest the head and legs.
Whip finish; the sparkle halo catching light is the whole trigger of this fly.