. Text book of zoology. Zoology. 278 Arthropoda. pupates immediately after birtli. On the Horse (and Cow) the active, winged Horse-tick {Hippohosca eqiiina) is found; in the wool of Sheep, the wingless Sheep-tick (Melophagus ovinus). The same mode of propagation is followed by the closely allied, small, blind, wingless Bee-louse {Braula cxca) parasitic on Honey-bees. The Fleas {Aphaniptera) are usually placed close to the Diptera, thoiigh probably incowectly. The body of these Insects is compressed, the coloui- bright yellow to dark brown, the head small with a 1 single ocellus on each side (i
. Text book of zoology. Zoology. 278 Arthropoda. pupates immediately after birtli. On the Horse (and Cow) the active, winged Horse-tick {Hippohosca eqiiina) is found; in the wool of Sheep, the wingless Sheep-tick (Melophagus ovinus). The same mode of propagation is followed by the closely allied, small, blind, wingless Bee-louse {Braula cxca) parasitic on Honey-bees. The Fleas {Aphaniptera) are usually placed close to the Diptera, thoiigh probably incowectly. The body of these Insects is compressed, the coloui- bright yellow to dark brown, the head small with a 1 single ocellus on each side (instead of the com- pound eye), the antennae small, clavate, and lying in a pit behind the eye. The mouth-pai-ts ai-e adapted for sucking, but ai-e very different in stnictui-e from those of the Diptera. The actual sucking-tube consists of the very long labnim which is grooved ventrally, and the two mandibles, which form a half-open tube; the first maxillse ai-e short, pointed, and provided with a foui-- jointed palp of considerable length ; they foi-m, together with the labiimi which can-ies two thi-ee- jointed palps, a kind of sheath for the time sucking-tube; a hypopharynx is absent. There are three distinct thoracic segments each beai-ing a pair of long powerful legs (the hind legs being Pig. 226. Puletc irritans. somewhat stronger than the others) with very 1 imago, 2 larva, 3 pupa.— large cOxse and pentamerous tarsi; they are After Tasohenberg. apterous. They live as parasites upon Mammalia and Birds. The larvse have neither eyes nor legs; the whitish body is cylindrical, somewhat haiiy; the mouth-parts are biting; before pupating they spin cocoons. They live in sweepings, etc. Pulex irritans is a parasite upon Man; and other species of the same genus also occur upon various other animals. The Chigoe or Jigger {Sarcopsylla penetrans) of the tropical regions of America sucks the blood of Man and other animals; the fertilised female bores into the skin, and as the ova deve
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
