. Elementary entomology. Insects. io6 ELEMENTA RV ENTOMOLOG Y adapted to their surroundings. Other members of this family, called psocids, are winged and look much like large plant-lice. The wings are of a dusky color, have a very characteristic venation, and are held roof-shaped over the back. Psocids feed on lichens and decay- ing wood and are fre- quently found in large masses on fences or tree trunks, where they are suspected of doing mischief, but they are entirely harmless and need not be disturbed. The biting bird-lice (Mallophaga) are curious looking, wingless para- FIG. 138. Biting li
. Elementary entomology. Insects. io6 ELEMENTA RV ENTOMOLOG Y adapted to their surroundings. Other members of this family, called psocids, are winged and look much like large plant-lice. The wings are of a dusky color, have a very characteristic venation, and are held roof-shaped over the back. Psocids feed on lichens and decay- ing wood and are fre- quently found in large masses on fences or tree trunks, where they are suspected of doing mischief, but they are entirely harmless and need not be disturbed. The biting bird-lice (Mallophaga) are curious looking, wingless para- FIG. 138. Biting lice (J/^/^^). (Greatly enlarged) sites whkh ^^ a, turkey-louse (Gomodes sty lifer Nitsch) (after Cuvier): r fu r nnil1rrv b, the biting dog-louse (Trichodectes latus Nitsch) (after [ Poultry Denny). (From Osborn, United States Department of birds, while SOIHC infCSt Agriculture) -, , sheep and mammals. They have biting mouth-parts and feed on feathers, hair, and bits of skin, thus differing from the true lice (see p. 121), which have sucking mouth-parts with which they extract the blood. The flat- tened bodies and curiously shaped heads enable one to identify them readily. A dust bath, with a frequent thorough cleansing of the poultry house by spraying with kerosene and then whitewash- ing, will usually prevent serious annoyance to 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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