. The black scale. Scale insects. Fig. 17.—Hemispherical Scale on twig of Fig. 18.—Soft brown scales with exit holes of Aphycus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Quayle, H. J. (Henry Josef), 1876-; Rust, E. W. (Everett Winder), 1884-. Berkeley, Cal. : Agricultural Experiment Station

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscalein, bookyear1911