. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 266 MANUAL OF ZOOLOGY. with antennsE, jaws, and usually simple eyes. The mouth of the caterpillar, unlike that of the perfect insect, is formed for mastication. The labium also is provided with a tubular organ —the " spinneret"—which communicates with two internal glands, the functions of which are to furnish the silk, whereby the animal constructs its ordinary abode or spins its cocoon. The three segments behind the head correspond with the pro- thorax, meso-thorax, an
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 266 MANUAL OF ZOOLOGY. with antennsE, jaws, and usually simple eyes. The mouth of the caterpillar, unlike that of the perfect insect, is formed for mastication. The labium also is provided with a tubular organ —the " spinneret"—which communicates with two internal glands, the functions of which are to furnish the silk, whereby the animal constructs its ordinary abode or spins its cocoon. The three segments behind the head correspond with the pro- thorax, meso-thorax, and meta-thorax of the perfect insect, and each carries a pair of jointed walking-legs. Besides these thoracic legs, there is a variable number, (generally ten) of soft fleshy legs, which are borne by the segments of the abdomen, and are known as "; Each is usually furnished with a crown of small horny hooks, and they are never attached to the 4th, sth, loth, and nth abdominal Fig. 93.—Large White Cabbage Butterfly {Pontta hrassica). a Larva or caterpillar; b Pupa or chrysalis ; c Imago or perfect insect. ^ In the Diurnal Lepidoptera, or Butterflies proper (fig. 93), the antennae are knobbed; the wings are usually held erect when the insect is in a state of repose; the larvse have six thoracic legs, and ten pro-legs; and the pupse are always naked, attached by the posterior extremity or head downwards, and usually angular. In the Crepuscular Lepidoptera, including those forms which are active during the twilight, the antennae are fusiform, or grow gradually thicker from the base to the apex; the wings are horizontal or Uttle inclined wl^en the insect is at rest; the posterior wings have their front margins furnished with a rigid. 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 work
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Keywords: ., bookauthorni, bookcentury1800, bookdecade1870, booksubjectzoology
