. The animal creation: a popular introduction to zoology. Zoology. 146 HYMENOPTEEA. to form a net-work * Their economy in the early stages of their growth is very curious. The larva, which is not. Fig. 105.—PUPA CASE, laeva, and fly of caddis-wokm. unlike a caterpillar, forms for its residence a tubular case, made of minute shells, stones, seeds, bits of stick or bark, fragments of the stems of water-plants, and similar matters, which it arranges around its body, fixing them by means of a glutinous silk, vfhich also lines the tube. Numbers of these cases may often be seen at the bottom of pebb
. The animal creation: a popular introduction to zoology. Zoology. 146 HYMENOPTEEA. to form a net-work * Their economy in the early stages of their growth is very curious. The larva, which is not. Fig. 105.—PUPA CASE, laeva, and fly of caddis-wokm. unlike a caterpillar, forms for its residence a tubular case, made of minute shells, stones, seeds, bits of stick or bark, fragments of the stems of water-plants, and similar matters, which it arranges around its body, fixing them by means of a glutinous silk, vfhich also lines the tube. Numbers of these cases may often be seen at the bottom of pebbly streams, with the head and feet of the larva protruding from one end as it crawls about, with a straggling irregular motion. When full grown, the little creature creeps up the stem of some aquatic plant till the mouth of its case just reaches the surface of the water; it then spins a net of silk across the entrance to its abode, and goes into the pupa state. At the appointed time the pupa tears its way easily through the silken grate, crawls a few inches out of the water, thi'ows off its pupa skin, and becomes a winged caddis-fly. Order The Hymenopterous insects, like the Neuroptera, are furnished with four transparent wings, but instead of the nervures forming a close net-work, they are much more sparingly distributed. Another difference is that in the Hymenoptera the hind pair of wings seem as if cut out of the front pair, -with which they interlock by means of small hooks during flight, so that the two wings almost resemble one. The abdomen is, moreover, terminated by an apparatus, * Some authors constitute a distinct order for them, under the name of Trichoptera, or Hairy-winged insects. t vfx^y, umeu, a membrane ; trrepoy, pteron, a 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 wor
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Keywords: ., bookauthorjo, bookcentury1800, bookdecade1860, booksubjectzoology
