. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. X. Orthoptera, 2^7 and remarkable modification; in the males a small notched ridge projects obliquely from each side of the abdomen, against which the hind femora are rubbed.^^ As the male is furnished with wings (the female being wingless), it is re- markable that the thighs are not rubbed in tlie usual manner against the "wing-covers; but this may perhaps be accounted for by the unusually small size of the hind-legs. I have not been able to examine the inner surface of th


. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. Chap. X. Orthoptera, 2^7 and remarkable modification; in the males a small notched ridge projects obliquely from each side of the abdomen, against which the hind femora are rubbed.^^ As the male is furnished with wings (the female being wingless), it is re- markable that the thighs are not rubbed in tlie usual manner against the "wing-covers; but this may perhaps be accounted for by the unusually small size of the hind-legs. I have not been able to examine the inner surface of the thighs, which, judging. Fig. 15. Pneumora (from specimens in the British Museum). Upper figure, male; lower figure, female. from analogy, would be finely serrated. The species of Pneumora have been more profoundly modified for the sake of stridulation than any other orthopterous insect; for in the male the whole body has been converted into a musical instrument, being *• Westwood, ' Mode] u Classification,' vol. i. p. 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 Darwin, Charles, 1809-1882. New York : D. Appleton and Company


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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear