Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 THE INSECT WORLD. 199 beetles belonging to this series. None of them are in any way injurious. The exception in food habits in this family is found in the genus Trox, containing oblong, very convex species, with rough, tuberculate or pitted wing-covers, and a deeply furrowed thorax. They are usually more or less incrusted with dirt, are found feeding under old skins, bones, or hoofs, and are, as scavengers, at least innoxious.
Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges . economicentomolo00insmit Year: 1896 THE INSECT WORLD. 199 beetles belonging to this series. None of them are in any way injurious. The exception in food habits in this family is found in the genus Trox, containing oblong, very convex species, with rough, tuberculate or pitted wing-covers, and a deeply furrowed thorax. They are usually more or less incrusted with dirt, are found feeding under old skins, bones, or hoofs, and are, as scavengers, at least innoxious. The more typical '' leaf-chafers'' are of diverse forms, often common and economically important. Among the first we reach Fig. 188. Rose-chafer, Macrodaclylussubspinosus.—a, beetle; b, head and thorax, in outline, from side; ^to^, structural details. the genus Macrodadyliis, of which the '' rose-chafer,'' or '' rose-bug ' is a member. This appears in June at about the time roses and grapes come into blossom, and eats their flowers in preference to anything else. Occasionally, for a series of years, the insects appear in ever- increasing abundance, until the swarms are so great that they ruin not only vineyards but orchards and gardens, eating almost every kind of fruit and flower. In the presence of such swarms we are almost helpless, and insecticides are of no possible use. No contact poison kills them, and the arsenites or other stomach
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