Dave, the pebble cased ones were the yellowish tan bodied ones with black head parts. They looked just like the ones i usually find in most of the local streams here. The others, I can't really say, since they were smaller, narrow in diameter, tapered to narrower at the back end, and I didn't rip them out of their cases. I don't know doodly squat about all the different species of caddis, mayflies, and stoneflies. Just some bare basics.