. Economic entomology for the . Oyster-shell scale, Mytilaspis poniorum.—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: ., bo, bookcentury1800, bookdecade1890, bookpublishernp, bookyear1896