Having no armor for its protection

J. W. Buel, The Savage World A Complete Natural History of the World’s Creatures, Fishes, Reptiles, Insects, Birds and Mammals, Philadelphie, Historical Publishing Company, 1891.

The earwing like some other insects is a very devored mother. The caddis-fly, having no armor for its protection, conceals itself frim its enemy the fisher, by surrounding itself with a tube, which it makes out of earth and sticks.