. Elements of comparative zoology. Zoology. INSECTS. 245 process of molting must be repeated. With each of these molts the animal grows more like the adult, the wings appearing first as small pads upon the back (fig. 69), and with later molts attaining the final size. In other words, the Orthoptera are hemimetabolous. It is an easy matter to follow these changes by catching the young hoppers in the spring, and keeping them in a breeding-cage, feeding them frequently with fresh grass and leaves. The student must keep this history in mind v when studying the peculiarities of the beetles. With fe
. Elements of comparative zoology. Zoology. INSECTS. 245 process of molting must be repeated. With each of these molts the animal grows more like the adult, the wings appearing first as small pads upon the back (fig. 69), and with later molts attaining the final size. In other words, the Orthoptera are hemimetabolous. It is an easy matter to follow these changes by catching the young hoppers in the spring, and keeping them in a breeding-cage, feeding them frequently with fresh grass and leaves. The student must keep this history in mind v when studying the peculiarities of the beetles. With few exceptions the Or- thoptera are injurious to human interests, since they are vegetable- feeders, and, as they often occur in immense numbers, they can destroy all crops throughout large districts. Possibly the most disagreeable members of the group are the cockroaches, flattened forms, many of them wingless, which are familiar from the persistence with which they haunt our dwellings, etc., after they have once been introduced. Our familiar' Croton bug' is an immigrant from Europe, but we have also our native species. Insect-powder and eternal vigilance are the .,, FIG. 70. — Tropical walking- only means known to rid a build- stick (Acanthodems}. From Hertwig. ing of these pests. Strangest of our Orthoptera are the 'walking-sticks';. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
Size: 828px × 3018px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
