. A text-book of agricultural zoology. Zoology, Economic. 260 APTEEA. of its own, either over a piece of water, along some lane, or in some glade in a wood. There are some (Libellulidce) which are beautiful fragile insects (Caiepteryx). The eggs are laid in the water or on aquatic plants. The young (fig. 134, b) possess no traces of wings. They commence to show after the third or fourth moult (c, w). The nymph (c) has a much shorter body than the adult, and, previous to hatching, crawls up the stem of some water-plant, when the shell splits, and the perfect Dragon-fly emerges. AFTERA. Lastly,
. A text-book of agricultural zoology. Zoology, Economic. 260 APTEEA. of its own, either over a piece of water, along some lane, or in some glade in a wood. There are some (Libellulidce) which are beautiful fragile insects (Caiepteryx). The eggs are laid in the water or on aquatic plants. The young (fig. 134, b) possess no traces of wings. They commence to show after the third or fourth moult (c, w). The nymph (c) has a much shorter body than the adult, and, previous to hatching, crawls up the stem of some water-plant, when the shell splits, and the perfect Dragon-fly emerges. AFTERA. Lastly, we have the wingless primitive insects, the Collem- bola and Thyeanura, now united into one order, the Aptera. They are popularly called " ; There are never any wings or rudiments of such, but always three pairs of legs, and long or moderately long antennae. They practically remain in the larval stage throughout life. The Thysanura have ten segments in the abdomen; the CoUembola have six or less segments, and the first one is always provided ventrally with a curious tube, which is absent in the Thysanura. The Col- lemhola have the power of leaping or skipping intot he air : some have a long, forked, ventral process towards the anus, which is used as a leaping apparatus. Some Gollemhola are now and then injurious (Smynthwus), and a few Thy- sanura are more or less noxious, as the Silver Fish (Lepisma saccharina) (fig. 135), a curious silvery form found in books and in houses 135.—Silver Fish {Ls^isma, saccharina).. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
