The standpoint of craftsmanship are intensely interesting

Richard A. Muttkowski, « The Food of Trout in Yellowstone National Park », Roosevelt Wild Life Bulletin, The New York State College of Forestry at Syracuse University, vol. 2 n°4, february 1925, p. 481.

The third groupe, the caddis-flies, derive their name from the fact that nearly all of them, in their aquatic stage, build cases from bits of stone, wood, or fibres, or weave a net which they attach to stones. These case are infinitely varied form, and from the standpoint of craftsmanship are intensely interesting. In the mountains one finds three types especially abundant. The first is that of the « barnacle » caddis-worm s (Rhyacophila sp.),which build their cases in large clusters from tiny stones (see fig. 27). The second is that of the « picket » cadis-worms (Limnephilus sp.) which build square cases of neatly paralleled series of plant fibers. Since the case are fastened to the support by their bases and stand out at right angles, the name «  picket » is quite appropriate (figs. 126, 127). The third type is made up of extremely minute particles of sand and secretion gummed together to form a conical, gently-curved cornucopia about half an inch in length .