Kenneth Dawson, From Major to Minor: some keys for anglers, Londres, Country Life, 1928, p. 138.

Caddis and « Cusses » Another important family of aquatic flies is the Trichoptera, or sedges, the larvae of which are the familiar caddis worms, which are sometimes found in large quantities in some rocky streams.
The caddis worm makes a curious domicile for itself out of bits of sticks or tiny stones cemented together. They are very valuable for food, but often when the trout are gorging themselves on the caddis worm in May is quite useless, since the fish are too…