Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1917 Excerpt: ... PAGE 6. Glands at femoro-tibial articulations of beetles and ants as scent-producing organs 48 7. Tufts of hair on tibiae of male moths as scent-producing organs 51 8. Pair of lateral tufts of hair at anterior end of abdomen of male moths as scent-producing organs 53 9. Various structures at ventro-posterior end of abdomen of certain Lepidoptera as scent-producing organs 54 (a) Invaginated sacs, tufts of hair and scent groove of certain moths 54 (b) Styled knobs and invaginated sacs of certain butter flies 56 10. Anal glands as scent-producing organs 57 (a) Anal glands of cockroaches 57 (b) Anal glands of beetles 57 (c) Anal glands of ants 63 11. Invaginated sacs and pouches at dorso-posterior end of abdomen as scent-producing organs 63 (a) Invaginated sacs and pouches of certain Orthoptera 63 (b) Invaginated pouch of honey-bee 65 C. Summary of scent-producing organs of insects 65 Bibliography 69 INTRODUCTION It has always been a matter of conjecture as to how the various lower animals recognize each other, and by what means the sexes of any species distinguish one another. At first thought it might be claimed that sight is the chief means by which any animal having eyes can recognize other animals, but after a second thought we recall that the eyes in the lower animals are not as highly developed as they are in the higher animals; and we know that many of the lower animals live in dark places and that some of them are partially or totally blind. For example, the eyes of some beetles and spiders inhabiting caves function little or not at all, and despite this fact, these animals seem to distinguish one another as easily as do those with normal eyes living in light places. Relative to blind or partially blind species, touch may be the chief means by which th...
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