Ralph, in his article on Glossosoma, describes this bug as one of the most overlooked caddis species in the Eastern Sierras and that is not the only place they will be found.The Birds Nest is one effective pattern for that hatch in #16-#16, but there are some others that work just as well and perhaps better. If there is an interest in knowing more about this bug and patterns that work to imitate them, here's some further information:
http://flyfishingtraditions.blogspot...ase-maker.html
This is the Glossosoma Larva tied by Craig Matthews:
https://www.youtube.com/watch?v=gYayGbx3rdA#t=150
...and this is the recipe for the Deep Sparkle Pupa version which I use, a lot:
G2X (Glossosoma alacense) DEEP SPARKLE PUPA...
HOOK: TMC 3761, Daiichi 1560, #16 -#18
THREAD: Tiemco,16/0, White Under Abdomen - Tiemco 16.0, Brown - Thorax forward
WEIGHT: .010 lead wire
VEIL:
One-half chocolate brown Antron
One-eighth rust Antron
One-eighth hare?s ear Antron
One-quarter white Antron
ABDOMEN: 1 strand flash, 8-10 strands non-flash Pink DNA Holo Fusion
THORAX: Iridescent Peacock Fiber, Brown, Spirit River
BEAD: Plummeting Tungsten, 3/32" or 5/64", Metallic Brown
...any of these patterns can be touched up with a light dusting of Frog's Fanny to assist in the "bubble effect" before plunking it into the water.. there is one other pattern I use to mimic the diving female and that is just a killer pattern called TBT (that black thingee’ on ‘yer waders)...
PT/TB