Here's another great video by Tightline Productions - Tim Flagler - of our friend John Collins tying his Electric Caddis larva. In this case, John is tying a Rockworm larva - genus Rhyacophila, which are present throughout the year in Eastern rivers and streams. By just changing the wire and tubing color, you can imitate any caddis larva you wish. I can say from experience, these flies work.
Sharpen your hooks!