. Elementary zoology. Zoology. 182 ELEMENTARY ZOOLOGY arise the two pairs of wings which are the most striking structural features of insects. Not all insects are winged, (fig. 45), and of those which are a few have only one pair of wings, but the great majority of them have two pairs of wTell-developed wings (fig. 46), which give them, as com- pared with the other animals we have studied, a new and most effective means of locomotion. The great numbers. Fig. 46.—A four-winged insect; a stone fly, Per la sp., common about brooks. (From Jenkins and Kellogg.) of insects and their preponderance am
. Elementary zoology. Zoology. 182 ELEMENTARY ZOOLOGY arise the two pairs of wings which are the most striking structural features of insects. Not all insects are winged, (fig. 45), and of those which are a few have only one pair of wings, but the great majority of them have two pairs of wTell-developed wings (fig. 46), which give them, as com- pared with the other animals we have studied, a new and most effective means of locomotion. The great numbers. Fig. 46.—A four-winged insect; a stone fly, Per la sp., common about brooks. (From Jenkins and Kellogg.) of insects and their preponderance among living animals is undoubtedly largely due to the advantage derived from their power of flight. The hindmost part of the body, the abdomen, is composed of from seven to eleven seg- ments, only the last one or two of which are ever provided with appendages. When such posterior abdominal appendages are present they form egg-laying or stinging or clasping 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York : H. Holt and company
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