. Elementary text-book of zoology. Zoology. r»i;s INSECTA. rudimentary biting mouth parts, an indistinctly segmented thorax, and an abdomen which usually consists of nine segments. Fam. Pediculidae. Lice. With fleshy proboscis-sheath armed with recurved hooks, protrusible suctorial tube, and two protrusible knife-like stylets. The antennas have five joints. The feet, which are adapted for clinging, have hooked terminal joints. The eyes are small and not facetted. The animals live on the skin of Mammalia, and suck their blood, and lay their pear-shaped eggs in the roots of the hair. The young,
. Elementary text-book of zoology. Zoology. r»i;s INSECTA. rudimentary biting mouth parts, an indistinctly segmented thorax, and an abdomen which usually consists of nine segments. Fam. Pediculidae. Lice. With fleshy proboscis-sheath armed with recurved hooks, protrusible suctorial tube, and two protrusible knife-like stylets. The antennas have five joints. The feet, which are adapted for clinging, have hooked terminal joints. The eyes are small and not facetted. The animals live on the skin of Mammalia, and suck their blood, and lay their pear-shaped eggs in the roots of the hair. The young, when hatched, do not undergo a metamorphosis, and the louse which infects the human head, is fully developed and capable of reproduction in eighteen days. Pcdicultis capltis Deg. Head- louse of man. P. restimenti Burm. (larger and of pale colour). Phthlrius jmbis L. (tig. 471). Fam. Mallophaga (Anoplura) (Pelzfresser). Lice-like in form, with thn-e- to five-jointed antenna-, and biting mouth parts, no fleshy proboscis, but a sort of suctorial tube. They live on the skin of Mammalia and Birds, and feed on young hairs and feathers, but also on blood. Trlcltodectes conh Deg. PJiih>jjfen/.<t anse-ris Sulz. Mi-nopon Nitsch, M. piiUldiini Nitsch. on fowls. Sub-order 2. Phy- tophthires. * Rhyn- chota with two pairs of membranous wings. The female is usually apterous. The surface of the skin is very often covered with a dense waxy deposit, the product of cuta- neous glands which are placed in groups beneath warty prominences of the FIG. 471.—Phthiriits pubis (after Landoig) St, Stigma; TV, Trachea. Fam. Coccidae (Schildlause). The large females have a shield-shaped body, and are wingless. The males are much smaller, and have large front wings, and sometimes also rudimentary hind wings. The fully-developed males have no proboscis or piercing weapons, and do not take in nourishment, while the unwieldy, often unsymmetrical females, which may even have lost the segmenta
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
