William W. Michael, Dry-Fly Trout Fishing, New York, McGraw-Hill Book Company, 1951.
The Trichoptera are the familiar caddis flies. Every fisherman, be he wet or dry, is familiar with the caddis cases found clinging to submerged sticks or to the rocks on the bottom of the stream. Often the bait fisherman will extract the larva from these cases and use it for bait. In cleaning trout one often finds their stomachs full of these caddis cases, a favorite food. The eggs are laid in the water in a gelatinous state, and when the larvae emerge, they incase themselves with any material available, which they cement together to form the « caddis case »