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1
Walsh, a distinguished entomologist of the United States, has described what he calls Phytophagic varieties and Phytophagic species.
The Origin of Species by Means of Natural Selection / Or, the Pr...
2
For " Phytophagic Varieties and Phytophagic Species" see "Proc.
More Letters of Charles Darwin — Volume 1 / A Record of His Work...