A perfect and shapely cylinder

L.N. Badenoch, Romance of the Insect World, Londres et New York, MacMillan & Co., 1893, p. 105-106.


Remarkable residences built under water by the larvae of Caddis Flies (Trichoptera) are wonderfully like these homes of Psychidae. They are composed of fine stems of rushes and other plants, of bits of stick, leaves of grasses, minute piece of bark and wood, fresh or decayed, of grains of sand, or gravel or mud, of hay, and any such debris that may have fallen into the water. Small fresh-water shells, yet occupied by their living inhabitants, are even affixed by the caddis to its case by their flat exterior, and the material or material are glued together with a waterproof cement. The tubes tend to assume the cylindrical shape, and the interiors are lined with silk. Sometimes short lengths of plant stems are placed longitudinally side by side, with the ulmost regularity, to form a perfect and shapely cylinder, perhaps four inches long. The morsels may be wound spiral fashion, or may be disposed into a many-sided structure, and so on in endless variety of arrangement.