Archive image from page 306 of The descent of man, and. The descent of man, and selection in relation to sex descentofmanse00darw Year: 1870 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.—
Archive image from page 306 of The descent of man, and. The descent of man, and selection in relation to sex descentofmanse00darw Year: 1870 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 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 South African Landois. ibid. s. 113. ' ' Insects of New England,' 1842, p. 133.
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