A Text-book of Entomology: Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects, for Use in Agricultural and Technical Schools and Colleges as Well as by the Working EntomologistMacmillan, 1898 - 729 sayfa |
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Diğer baskılar - Tümünü görüntüle
Sık kullanılan terimler ve kelime öbekleri
abdominal segments acid Anatomie antennæ Anzeiger appendages Archiv f arise arthropods bees beetles blood body brain branches caterpillars cavity cells chitinous cockroach Coleoptera colors coxal glands cuticula developed Dewitz digestive canal Diptera dorsal duct Dyticus edge elytra embryo eversible eyes fat-body fibres fluid folds fore ganglia ganglion genital glandular Graber hairs head Hemiptera hind Hymenoptera hypodermis hypopharynx insects Insekten integument intestine invagination Jahrg joint Kolbe labrum larva larvæ layer legs Lepidoptera Leydig lobes longitudinal Lubbock male mandibles maxillæ median membrane mesothorax metathorax mid-intestine muscles muscular mushroom bodies nerve Newport nymph observed olfactory opening optic organs Orthoptera ovipositor pair pass pigment pits plate primitive band prothorax pupa Recherches rudiments salivary glands secretion seen Sér side situated spiracles stigmata stomach structure surface tænidia taste-cups thoracic thread Thysanura trachea tracheal gills Trichoptera Ueber urinary tubes ventral wings wissens Zeitschr Zool
Popüler pasajlar
Sayfa 620 - ... work, the cocoon is so far completed that the worm can hardly be distinguished through the fine texture of the wall; then a gummy resinous substance, sometimes of a light brown color, is spread over all the inside of the cocoon. The larva continues to work for four or five days, hardly taking a few minutes of rest, and finally another coating is spun in the interior, when the cocoon is all finished and completely air tight.
Sayfa 144 - The wings must be regarded as homologous with the lamellar tracheal gills, for they do not only agree with them in origin, but also in their connection with the body, and in structure. In being limited to the second and third thoracic segments they point to a reduction in the number of the tracheal gills. It is quite clear...
Sayfa 3 - Packard stated : *It is becoming evident, however, that there was no common ancestor of the Arthropoda as a whole, and that the group is a polyphyletic one. Hence, though a convenient group, it is a somewhat artificial one, and may eventually be dismembered into at least three or four phyla or branches.
Sayfa 295 - A' ; its voice, however, is an octave higher, and often goes to B" and C". The sounds produced by the wings are constant in each species, except where, as in Bombus, there are individuals of different sizes; in these the larger ones generally give a higher note. Thus, the comparatively small male of B. terrestris hums on A', while the large female hums an entire octave higher. Consult Sharp, 'Insects' (New York 1899); Packard, 'Textbook of Entomology
Sayfa 260 - Insects with compound eyes do not notice differences of form existing between two light orifices, and are deceived by an excess of luminous intensity as well as by the apparent excess of surface. In short, they do not distinguish the form of objects, or, if they do, distinguish them very badly.
Sayfa 597 - A caterpillar is not, in -fact, a simple but a compound animal, containing within it the germ of the future butterfly, enclosed in what will be the case of the pupa, which is itself included in the three or more skins, one over the other, that will successively cover the larva.
Sayfa 643 - When that period has arrived, the skin bursts along the back part of the third segment, or mesothorax, and is extended along the second and fourth, while the coverings of the head separate into three pieces. The insect then exerts itself to the utmost to extend the fissure along the segments of the abdomen, and in the meantime, pressing its body through the opening, gradually withdraws its antennae and legs, while the skin, by successive contortions of the abdomen, is slipped backwards, and forced...
Sayfa 202 - There cannot be more than four layers in the wings and scales, which show principally such colors in insects, two external ones belonging to the cuticula, and two internal ones belonging to the hypodermis. The naked wings of Diptera and Neuroptera often show beautiful interference colors. The scales of Entimus and other Curculionidae are well known for their brilliancy, and it is interesting to remark that when dry scales are examined with the microscope, many are found partly injured, which give...
Sayfa 292 - ... than any intermediate notes. These hairs, then, are specially tuned so as to respond to vibrations numbering 512 per second. Other hairs vibrated to other notes, extending through the middle and next higher octave of the piano. Mayer then made large wooden models of these hairs, and, on counting the number of vibrations they made when they were clamped at one end and then drawn on one side, he found that it " coincided with the ratio existing between the numbers of vibrations of the forks to...
Sayfa 427 - Hampshire (Photinus ?) is perfectly continuous, without trace of lines either bright or dark. It extends from a little above Fraunhofer's line C in the scarlet to about F in the blue, gradually fading at the extremities. It is noticeable that precisely this portion of the spectrum is composed of rays, which, -while they more powerfully than any others affect the 1 Mosely: Notes by a Naturalist on HMS Challenger, 1892, p.