. A manual for the study of insects. Insects. Fig. 228. Fig. 229. build tubes of sand make spiral houses which very closely resemble in form snail-shells (Fig. 229). Whether stones or wood are used to build houses the material is always fastened together by silk, which the larvae spin from the mouth in the same manner as do cater- pillars. In some species the case is composed entirely of silk. Figure 230 represents the form of such a case, which Fig. 230, . r ^ â \ IS common m some of our lakes. Among the simplest of the various forms of houses built by Caddice-worms are those made by c
. A manual for the study of insects. Insects. Fig. 228. Fig. 229. build tubes of sand make spiral houses which very closely resemble in form snail-shells (Fig. 229). Whether stones or wood are used to build houses the material is always fastened together by silk, which the larvae spin from the mouth in the same manner as do cater- pillars. In some species the case is composed entirely of silk. Figure 230 represents the form of such a case, which Fig. 230, . r ^ â \ IS common m some of our lakes. Among the simplest of the various forms of houses built by Caddice-worms are those made by certain species that live under stones in rapid streams. These consist merely of a few pebbles fastened to the lower surface of a larger stone by threads of silk. In the space between these pebbles the worm makes a more or less perfect tube of silk, within which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
