J. G. Wood, The Boy’s Own Book of Natural History, Londres, George Routlege & Sons, 1886, p. 358-359.

The Caddis-Fly -This fly is a well-know to every angler both in its larva and in its perfect state. The larva is a soft white worm, of which fishes are exceedingly fond, and it therefore requires some means of defence. It according actually makes for itself a movable house of sand, smalls stones, straws, bits of shells, or even small living shells, in which it lives in perfect security, and crawls about in search of food, dragging its house after it.