Seems like I just wrote about this Caddis behemoth. Here is a nice piece by Philip Rowley @ Fly Craft Angling …..factors I found interesting were different larva casings depending upon location in the stream, behavioural drift, coloration and size of the stages, and the when on Western U.S. streams. Time to tie big wets and dries on light wire hooks…reads as if they are already busy and getting ready to do their wing thing…September, October and November. Lots of pattern options via Google Images.