This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
Troutnut on Feb 18, 2008February 18th, 2008, 4:05 pm EST
I haven't used that pattern so I'm not very familiar with it, but based on googling it, it seems to be intended to imitate a caddis pupa, or sometimes a midge pupa. Therefore the colors and size that work best would depend on what's hatching at the time. I would guess olive is a good overall bet.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist