. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING INSECTS BANKS. 23 plicated metamorphosis. The first larva, called a triungulin, is a minute insect with six long legs and a pair of bristles at tip of body. All stages should be mounted upon slides. Fig. 45.—A caddicefly, larva, and its case. (From Packard.) This order includes the caddiceflies (fig. 45), or watermoths. They have a general resemblance to moths, or millers, but have hairs instead of scales upon the wings and body. Many are attracted to electric lights. The antennae are slender and simpl
. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING INSECTS BANKS. 23 plicated metamorphosis. The first larva, called a triungulin, is a minute insect with six long legs and a pair of bristles at tip of body. All stages should be mounted upon slides. Fig. 45.—A caddicefly, larva, and its case. (From Packard.) This order includes the caddiceflies (fig. 45), or watermoths. They have a general resemblance to moths, or millers, but have hairs instead of scales upon the wings and body. Many are attracted to electric lights. The antennae are slender and simple, the hind wings broader than the fore pair, and the posterior part folds as a fan. The adult insects have very weak mouth-parts and take no nourishment. The larvae and pupae live in the water of ponds and streams. Many of them make cases of pebbles, sticks, or leaves, which they carry about with them. Others spin a web or net in the water. The former live upon aquatic vege- tation; the latter are predaceous. They pupate within their cases, closing up the entrance with a mesh of threads. None of them are of economic impor- tance, and they are most abundant in the colder parts ot the country. LEPIDOPTERA. This order com- prises the butterflies (figs. 46, 131, 132) and moths, or millers (figs. 133, 134, 158). The handsome col- ors of many species have made this order the most popular one with entomologists. The metamorphosis is complete, and the transformation from the pupa or chrysalis to the butterfly has been a marvel to all observers, and frequently applied to human life. The beauty of these frail. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by t
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