. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. 490 Div. 3. ARTICULATA—INSECTA. Class 3. or conical, the base of which is covered by two scales. These characters exclusively distin- guish it from all other insects, including the Ilemiptera, with which it was ranged by Fabricins. The Suctoria, moreover, undergo real metamorphoses, analogous to those of many two-winged insects, as the Tipulidae. This order is composed of the single genus of Fleas,— PuLEX, Linn. The body is oval, compressed, inclose
. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. 490 Div. 3. ARTICULATA—INSECTA. Class 3. or conical, the base of which is covered by two scales. These characters exclusively distin- guish it from all other insects, including the Ilemiptera, with which it was ranged by Fabricins. The Suctoria, moreover, undergo real metamorphoses, analogous to those of many two-winged insects, as the Tipulidae. This order is composed of the single genus of Fleas,— PuLEX, Linn. The body is oval, compressed, inclosed in a tough skin, and divided into twelve segments, of which three compose the trunk, which is short, and the others the abdomen. The head is small, very com- pressed, rounded above, truncate, and ciliated in front. It has, on each side, a small, round eye, be- hind which is a cavity, in which is placed a small, moveable body, furnished with minute spines. At the anterior edge, near the base of the beak, are situated the pieces which have been considered as the antennae, which are scarcely so long as the head, and are composed of four nearly cylindrical joints. The sheath of the beak is composed of three joints. The abdomen is very large, and each of its seg- ments is divided in two, being formed of two plates, one superior and the other inferior. The legs are robust, particularly the posterior, fitted for leaping, spinose, with the coxse and thighs very large, and the tarsi composed of five joints, the last terminated by two long nails. The two fore-legs are inserted almost beneath the head, and the beak is placed between them. The female lays about a dozen white, shghtly viscid eggs, whence emerge small larvae, destitute of legs, very much elongated, resembling minute worms, very active, coiling themselves up in a circle or spire, serpenting in their progress, at first white and afterwards reddish. Their body is composed of a scaly head, without eyes, bearing two very mi
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1860, booksubjectzoology
