. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds. Birds; Birds. UTILITY OF BIRDS IN NATURE. 15 pupal form. This stage it passes without food and while fixed to some object. The pupse or nymphs of some other insects, however, move about freely, as is the case with locusts, grasshoppers, and like insects (Orthoptera).^ The pupa finally throws off its outer shell, and emerges a fully developed or perfect insect or imago with wi
. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds. Birds; Birds. UTILITY OF BIRDS IN NATURE. 15 pupal form. This stage it passes without food and while fixed to some object. The pupse or nymphs of some other insects, however, move about freely, as is the case with locusts, grasshoppers, and like insects (Orthoptera).^ The pupa finally throws off its outer shell, and emerges a fully developed or perfect insect or imago with wings ; although some insects which, like some birds, have lost the use of their wings, never ; After the union of the sexes the female insect eventually deposits the eggs for the. Pig. 8. —PupiE or chrj-salids. next generation. Thus we have four forms which insects assume : (1) the egg, (2) the larva, (3) the pupa or nymph, (4) the imago or perfect winged insect. Practically all living animals of appreciable size, as well as most plants that are visible to the unaided eye, furnish food for certain insects. Other insects feed on dead animals, dead trees, or other decaying animal or vegetable matter. A certain larva has been known even to tunnel into marble. Those insects Avhich ^ed on live vegetation or living animals are capable of doing great harm if they increase unduly; while those that feed only on dead animals or dead and decaying vegetation can do only good in nature, although they may be injurious to man by destroying hides, furs, pre- served meats, or clothing, It is difficult to perceive the usefulness of those so-called injurious species which feed on the different parts of plants ; still, the larvae that eat the buds, the caterpillars that feed ' In the Oithoptera the transformations are imperfect; the larvse of grass- hoppers, for example, are provided with well-developed legs, and much resemhle the imago or perfect insect, but are without wings. In this s
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