. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAT. X.] ORTHOPTERA. 303 of the nervures {a) on the under surface of the former is finely- serrated, and is scraped across the prominent nervures on the upper surface of the opposite or right wing. In our British Phasgonura viridissima it appeared to me that the serrated nervure is rubbed against the rounded hind-corner of the oppo- site wing, the edge of which is thickened, colored brown, and very sharp. In the right wing, but not in the left, there is a little plate, as transparent
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAT. X.] ORTHOPTERA. 303 of the nervures {a) on the under surface of the former is finely- serrated, and is scraped across the prominent nervures on the upper surface of the opposite or right wing. In our British Phasgonura viridissima it appeared to me that the serrated nervure is rubbed against the rounded hind-corner of the oppo- site wing, the edge of which is thickened, colored brown, and very sharp. In the right wing, but not in the left, there is a little plate, as transparent as talc, surrounded by nervures, and. Fia. 13.âChlorocoelus Xanana (from Bates). a,b. Lobesof opposite wing-overs. called the speculum. In Ephippiger viftum, a member of thit. game family, we have a curious subordinate modification ; for the wing-covers are greatly reduced in size, but "â the posterior part of the pro-thorax is elevated into a kind of dome over the wing-covers, and which has probably the effect of increasing the ; ^^ We thus see that the musical apparatus is more differentiated 9r specialized in the Locustidae (which include I believe, the »' Westwood. "Modern Class, of Insects^' vol. I *. *sa,. 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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