Archive image from page 515 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 504 INSECTA. inclose themselves. According to Kœsel, the eggs of the Dytiscus mm-ginalis hatch ten or twelve days after being deposited : at the end of four or five more, the larva is already four or five lines long, and moults for the first time. The second change of skin takes place at the expiration of a similar interval, and the animal is now as large again as it was before : when full grown it is two inches long. In summer
Archive image from page 515 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 504 INSECTA. inclose themselves. According to Kœsel, the eggs of the Dytiscus mm-ginalis hatch ten or twelve days after being deposited : at the end of four or five more, the larva is already four or five lines long, and moults for the first time. The second change of skin takes place at the expiration of a similar interval, and the animal is now as large again as it was before : when full grown it is two inches long. In summer it has been observed to become a pupa at the end of fifteen days, and a perfect insect in fifteen or twenty more days. This great genus is divisible as follows :— The majority have the antennae composed of eleven distinct joints ; the outer palpi filiform, or slightly thickened at the tips, and the base of the hind-legs exposed. Dytiscus, has all the tarsi composed of five distinct joints ; the three basal joints of the fore-legs being very large, and forming an oval or orbicular plate. Type, D. marginalis, Linn., a very common British species, an inch and a quarter long, being of a dark olive colour with a buflf-coloured raargm entirely round the thorax, and a line of the same colour on the outer margin of the elytra, which are not dilated at the sides ; those of the female are furrowed from the base about two thirds of the whole length. Fabricius says, that the species when laid upon its back gains its ordinary position by taking a leap. Esper kept a specimen of this insect for three years and a half in good health in a large bottle of water, feeding it every week and sometimes oftener with bits of raw beef about the size of a nut, upon which it precipitated itself and sucked the blood entirely from it. It was able to fast Fie. 55 —DytiBcus mu-i,inaiis and its larva. for a nionth at a time. It killed a specimen of Hijdro- philns piceus, although as large again as itself
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