http://www.westfly.com/entomology/caddis/october.shtml

About October Caddis

‘This is the Great Pumpkin of Western rivers, a caddis that is almost as large as a golden stonefly. As the name suggests, it emerges in fall.

http://oregonflyfishingblog.com/2008/09/26/fly-tying-video-morrish-october-caddis/