. The transformations (or metamorphoses) of insects (Insecta, Myriapoda, Arachnida, and Crustacea) : being an adaptation, for English readers, of M. Émile Blanchard's "Metamorphoses, moeurs et instincts des insects;" and a compilation from the works of Newport, Charles Darwin, Spence Bate, Fritz Müller, Packard, Lubbock, Stainton, and others. ght segments of the abdomen. Thespiracles are not found on the mesothorax and metathorax, whichsustain the wings, but these organs are full oftracheae. Nature has arranged the position of thespiracles in some insects with an evident design ;thus in the la
. The transformations (or metamorphoses) of insects (Insecta, Myriapoda, Arachnida, and Crustacea) : being an adaptation, for English readers, of M. Émile Blanchard's "Metamorphoses, moeurs et instincts des insects;" and a compilation from the works of Newport, Charles Darwin, Spence Bate, Fritz Müller, Packard, Lubbock, Stainton, and others. ght segments of the abdomen. Thespiracles are not found on the mesothorax and metathorax, whichsustain the wings, but these organs are full oftracheae. Nature has arranged the position of thespiracles in some insects with an evident design ;thus in the larvae of many flies there is only onepair of spiracles, and these external organs of res-piration—mouths, as it were—are situated quite atthe end of the body. Were it not so the larvaewould soon be stifled, for they dig deep into thebodies of the unfortunate creatures they infest,and feed luxuriantly, being embedded in theirnourishment. W^hen a man eats voraciously heoften has to stop to take breath, and no one candrink for any length of time without doing the same ; but theseparasitic larvae gormandise fearlessly. They breathe through thespiracles in the end of their bodies which are left sticking out inthe open air. Many of the larvae that bury themselves in decom-posing animal and vegetable matters breathe safely in this A SPIRACLE (Magnified). THE METAMORPHOSES OF THE RESPH^ATORY SYSTEM. 47 Dust is kept out of the spiracles by some fine hairs which areattached to them, and noxious gases and impure air can be shut
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Keywords: ., bookcentury1800, bookdecade1870, booksubjec, booksubjectcrustacea
