. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . Oyster-shell scale, M\tila'if<is pomoriDii.—a, female scale, from beneath, filled with eggs; b, same, from above ; c, twig infested by female scales ; d, male scale and a twig infested therewith. Perhaps the most common forms of this series are the '' oyster- shell' ' bark-lice, of which we have several species, deriving their common name from the fact that the scales have a marked resem- blance to the shells of some oysters. In the Northern United States Mytilaspis

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. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . Oyster-shell scale, M\tila'if<is pomoriDii.—a, female scale, from beneath, filled with eggs; b, same, from above ; c, twig infested by female scales ; d, male scale and a twig infested therewith. Perhaps the most common forms of this series are the '' oyster- shell' ' bark-lice, of which we have several species, deriving their common name from the fact that the scales have a marked resem- blance to the shells of some oysters. In the Northern United States Mytilaspis pomorum is the common form, infesting apple

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1