Sandfly,
You bug burned my go-to fly!!! 😉
The orange caddis pupa has made me a successful fly fisherman. It can resemble dead scuds, eggs, and the caddis itself. I have found orange caddis larve in every stream I have fished from the East Coast to the Rockies. I first read about this fly in an article written by Charlie Meck the Mid-Atlantic Fly Fishing Guide. He mentioned that he used this fly for prospecting. Mr. Meck was dead on. I've slammed fish on this pattern ever since. Every angler should carry this fly in their box.