. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE GEASSHOPPEIi 25 into the air, but, unlike all other insects, it undergoes an additional molt just before laying its eggs. As the insect is subjected to many accidents in its long and defence- less larval life and in its brief and precarious winged state, each species is preserved onlji' by producing an enormous number of young. The dragon-flies (Odona'ta) have four membranous, net-veined wings, of which the front pair are never larger than the hind ones. Their large heads carry relatively enormous eyes.
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. THE GEASSHOPPEIi 25 into the air, but, unlike all other insects, it undergoes an additional molt just before laying its eggs. As the insect is subjected to many accidents in its long and defence- less larval life and in its brief and precarious winged state, each species is preserved onlji' by producing an enormous number of young. The dragon-flies (Odona'ta) have four membranous, net-veined wings, of which the front pair are never larger than the hind ones. Their large heads carry relatively enormous eyes. Two groups of dragon- flies may be distinguished according as the wings when at rest are extended (Fig. 26) or folded together over the back. Dragon- flies live on the wing, hovering over water and preying upon other insects, especially mosquitoes. The eggs develop in the water into aquatic larvse which are quite unlike. FiQ. 2-2. — A scale insect (Lecanium). Remains of females after production of young; seen as swellings on the bark. Nat. size. Photo, by V. H. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
