Just had a crazy dry fly session on a west slope cascade stream. I got to a favorite run about 1pm in full direct sun to find a frenzy in progress. Rainbows were going airborne eating on the surface as a deep riffle pushed onto a rip rap bank. Gray drakes were buzzing around over head, and large brown caddis were laying eggs and emerging everywhere along the deep bank and I immediately was hooking up on a size 10 gray drake pattern. After action slowed down I took a few minutes to take in what had just happened when I realized the drakes were being blown upstream from the long slow deep stretch and they actually weren't on the water at all. It was the caddis the fish were going nuts for. They were 3/4"+ long and brown/tan. With the wind and precarious rip rap wading I was never able to catch one for close examination and in my excitement I didn't think to pick up any of the shucks piled up in the eddies. I did notice that when they emerged, within seconds they were in flight and when they laid eggs they would dap a couple times before sticking where they would float for 3-5 seconds before going airborne again. My drake pattern was the right size and must have been close enough in color to warrant attack. Anyways I've never seen that caddis hatch before and I'm dying to go back and capture some. I've been looking online but I'm not seeing a midday hatch like that with larger caddis and I'm a bit stumped as to what they were. Any help?