. Insects, their ways and means of living. Insects. B Fig. 134. The nymph of a dragonfly A, the entire insect, showing the long underlip, or labium (Li), closed against the under surface of the head. B, the head and first segment of the thorax of the nymph, with the labium ready for action, showing the strong grasping hooks with which the insect captures living prey Such cases, however, are only examples of the general rule that all things in nature show gradations; but this condi- tion, instead of upsetting our generalizations, furnishes the key to evolution, by which so many riddles may be s
. Insects, their ways and means of living. Insects. B Fig. 134. The nymph of a dragonfly A, the entire insect, showing the long underlip, or labium (Li), closed against the under surface of the head. B, the head and first segment of the thorax of the nymph, with the labium ready for action, showing the strong grasping hooks with which the insect captures living prey Such cases, however, are only examples of the general rule that all things in nature show gradations; but this condi- tion, instead of upsetting our generalizations, furnishes the key to evolution, by which so many riddles may be solved. The grub of the bee or the wasp (Fig. 133 B) gives an excellent example of the extreme specialization in form that the young of an insect may take on. The creature spends its whole life in a cell of the comb or the nest where [238]. 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 Snodgrass, R. E. (Robert E. ), 1875-1962. New York Smithsonian Institution series
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Keywords: ., bookauthorsnodgrassrerobert, bookcentury1900, booksubjectinsects
