The well-know

PoultonThe colours of animals their meaning and use especially considered in the case of  insects, Londres, Kegan Paul Trench Trubner and Co., 1890, p.77.

The well-know cases of Caddice-worm (Trichoptera) are partly for concealment and party for defence ; they are built of grains of sand, small shells (often alive), vegetable fragments, – in fact, of any suitable objects which are abundant at the bottom of the stream in which they happen to be.