. Biology in America. Biology. Sexual Difference in Beetles The males to the left, and females to the right. From Darwin's "Descent of Man," D. Applet on and 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger

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