Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 THE INSECT WORLD. 69 sites by their very rapid motions and their long antennae or feelers. Their food is starch, where they can get it, or dry ani- mal or vegetable matters, and they can be driven out by a free use of naphthaline crystals. Their injury in libraries is done by eating the starched surface of bindings, plates, and pages, and so disfiguring them. The forms just described are all wingless throughout their en- tire life, Atropo
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 THE INSECT WORLD. 69 sites by their very rapid motions and their long antennae or feelers. Their food is starch, where they can get it, or dry ani- mal or vegetable matters, and they can be driven out by a free use of naphthaline crystals. Their injury in libraries is done by eating the starched surface of bindings, plates, and pages, and so disfiguring them. The forms just described are all wingless throughout their en- tire life, Atropos {Clothilla) divinatoria and A. pulsatoria being common species. In some mysterious way the term 'death- watch' has been applied to these creatures, and they have been credited with making the ticking sound often heard at night in old houses, and which is supposed to give warning of a death to come. But there are some winged forms, and these somewhat resem- FiG. 37. Psocus lineatus, much enlarged. ble overgrown plant lice, differing, of course, by the mandibulate mouth. These winged Psocids sometimes occur in great num- bers on the bark of trees, in my experience most often on cherry and orange, where they feed upon lichens and other dry vege- table matter. They sometimes create alarm when great numbers are noticed by the farmer ; but none of them are in the least in- jurious. They are more cylindrical in appearance than the wing- less forms, and the thoracic parts are better developed and larger than the head, which bears the same coarsely granulated eyes and long antennae. When a group of specimens is disturbed they run in every direction, and often drop to the ground rather than use their wings in flight. Altogether, this family
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