. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. INSECTS. 325 lodged in a furrow designed to receive it^ and then draws the leg briskly up and down. He does not play both fiddles together, but alternately, first upon one and then on the other/^ In many species the base of the abdomen is hollowed out into a great cavity which is believed to act as a resounding board. In Pneumora (fig. 15), a S. Afri*'. PIr. 18. Pneumora (firom specimens in the British Museum).
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. INSECTS. 325 lodged in a furrow designed to receive it^ and then draws the leg briskly up and down. He does not play both fiddles together, but alternately, first upon one and then on the other/^ In many species the base of the abdomen is hollowed out into a great cavity which is believed to act as a resounding board. In Pneumora (fig. 15), a S. Afri*'. PIr. 18. Pneumora (firom specimens in the British Museum). Upper figure, male; lower figure, female. can genus belonging to the same family, we meet with a new 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.* A« the male is furnished with wings (the female being wing- * West wood, '* Modern ; 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 : A. L. Burt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
