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W. J. Müller, "Beiträge zur Naturgeschichte der Gattung Claviger," Germer u. Zincken's Magaz. d. Entomol., iii., 1881, pp. 69-112. There is little doubt, however, that some species of Aphides and allied Coccidæ would be liable to extermination if not protected by their ant masters. See, for instance, Forel, Bull. Soc. Vaud., 1876. Mr.
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