Vegetable matter

AnonymeGuide to the exhibited series of Insects in the Department of Zoology British Museum Natural History, Londres, Trustees of the British Museum, 1909, p. 40.

The larvae live in ponds and streams ; their food consists of vegetable matter. For the most part, they live in cases which are built in various ways and of different materials, such as stones, sand, shells, bits of weed, etc. Some of these cases are coiled, and being built of fine sand been mistaken for mollusc shells.