. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 83 his descriptiou -with our specimens, it not only disagrees gcnerically, as already explained, but neither the size nor the markings will corres- pond at all. We consider it, Iherel'ore, (o he sufficiently certain that tlie Apple-root Plant-louse does not belong to the genus (PempJiii/us'), to which all subsequent authors, in deference to Dr. Rich's authority, have hitherto referred it, but to the very distinct genus {Eriosomd) to wliich the notorious Wooly Plant-louse of Europe belongs {Eriosoma laniyera, Hausm.) And here a
. The American entomologist. Entomology. THE AMERICAN ENTOMOLOGIST. 83 his descriptiou -with our specimens, it not only disagrees gcnerically, as already explained, but neither the size nor the markings will corres- pond at all. We consider it, Iherel'ore, (o he sufficiently certain that tlie Apple-root Plant-louse does not belong to the genus (PempJiii/us'), to which all subsequent authors, in deference to Dr. Rich's authority, have hitherto referred it, but to the very distinct genus {Eriosomd) to wliich the notorious Wooly Plant-louse of Europe belongs {Eriosoma laniyera, Hausm.) And here arises a very interesting question : Is our American Ajjple-root Plant-louse identical with tlic Euro- pean Wooly Plant-louse? AVc think that it is not, for the three following reasons: 1st, The descriptions of the latter do not agree very well with our insect. 2d, The European species can not stand a hot climate, but is contiued to Bel- gium, the north of France, Germany and Eng- land; whereas our species thrives and flourishes best in a hot southern latitude. 3d, The Euro- pean species exclusively infests the trunk and branches of the apple-tree, and it is recorded that Sir Joseph Banks " long ago extirpated it from liis own apple-trees by the simple method of taking off all the rugged and dead old bark, and then scrubbing the trunk and branches with a hard brush" (Kirby and Spence, letter 6) ; whereas our American Koot-louse normally inhabits the roots, and is only occasionally and in small numbers found upon the trunk and branches, so that scrubbing and scraping the bark would have little or no effect towards ex- tirpating it. It has been said by several authors that the true Wooly Plant-louse of Europe exists in the Eastern States. We incline to believe that this is a mistake, and that in every such case the few individuals of our American Root-louse, that are often found upon the trunk and brandies and suckers, have been mistaken for the transatlan- tic species.
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