A couple of weeks ago I was checking out the contents of a steelies stomach. It was all caddis, some things I noticed:
forked tail.
small black head (fox pupa's I see in stores have peacock or ostrich herl that is much bigger than body)
2 prominent pairs of arms, legs were not prominent (pupa patterns have prominent legs).
bugs were pronouncedly curved

Were these caddis larva? What are the differences between pupa and larva? How come caddis pupa imitations dont have forked dark tails?