. Fresh-water biology. Freshwater biology. 900 FRESH-WATER BIOLOGY The Caddisflies {Order Trichoptera) The caddisflies constitute a large group of insects, nearly all of which are aquatic in their immature stages. Among the adults are many pretty species of soft colors and great elegance of form. Having rudimentary mouth parts they are short-lived. They are chiefly nocturnal in habits and fly to lights, often in great num- bers. Some are diurnal and hover over water in long sustained horizontal flight; others dance up and down in companies under the shelter of streamside trees. No insects are
. Fresh-water biology. Freshwater biology. 900 FRESH-WATER BIOLOGY The Caddisflies {Order Trichoptera) The caddisflies constitute a large group of insects, nearly all of which are aquatic in their immature stages. Among the adults are many pretty species of soft colors and great elegance of form. Having rudimentary mouth parts they are short-lived. They are chiefly nocturnal in habits and fly to lights, often in great num- bers. Some are diurnal and hover over water in long sustained horizontal flight; others dance up and down in companies under the shelter of streamside trees. No insects are more common about the wharf lights on the shores of our great lakes. The larvae exhibit great diversity of structure and habits. Much excellent work has been done on them in Europe, but our American forms are little known. The most familiar larvae are the well known "caddisworms" that construct portable cases (Fig. 1371),. Fig. 1371. Caddisworm cases. (Drawn by Mrs. J. H. Comstock.) in which to live, and carry them about on their backs. These cases are made out of a great variety of materials: sticks, small stones, sand grains, bits of shell, of leaves or of bark; in short, almost any solid material suitably small and available. In many species the construction of the cases is so uniform in pattern and materials that the larvae may be known by the houses which they drag about. The larvae of the Phrygeaneidae construct cylindrical cases made of bits of stems, grass, etc., placed lengthwise in a continu-. 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
