. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. X.' ORfHOPTERA, 305 shaped, elastic teeth, from 85 to 93 in number; '^ and these are scraped across the sharp, projecting nervures on the wing- covers, which are thus made to vibrate and resound. Harris ^^ says that when one of the males begins to play, he first '' bends the shank of the hind-leg beneath the thigh, where it is lodged in a furrow designed to receive it, and then draws the leg briskly up and down. He does not play both fid'. Fic. 15.—Pneumora (from spectinens in th
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. X.' ORfHOPTERA, 305 shaped, elastic teeth, from 85 to 93 in number; '^ and these are scraped across the sharp, projecting nervures on the wing- covers, which are thus made to vibrate and resound. Harris ^^ says that when one of the males begins to play, he first '' bends the shank of the hind-leg beneath the thigh, where it is lodged in a furrow designed to receive it, and then draws the leg briskly up and down. He does not play both fid'. Fic. 15.—Pneumora (from spectinens in the British Museum). Upper figure, male, lower figure, female. dies together, but alternately, first upon one and then on the ; 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 South African *^ Landois. ibid. s. 113. " " Insects of New England," 1842, 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 Hurst
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