. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 344 SEXUAL SELECTIOX. [I'aut II. wing which serves as the liddle itself. One of the ner- vures (a) ou the under surface of the former is finely ser- rated, aud is scraped across the prominent nervures on the upper surface of the opposite or right wing. In our Brit- isii FJcasfjonura viridisshna it appeared to me that the serrated nervure is rubbed against the rounded hind corner of the opposite wing, the edge of which is thick- en
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 344 SEXUAL SELECTIOX. [I'aut II. wing which serves as the liddle itself. One of the ner- vures (a) ou the under surface of the former is finely ser- rated, aud is scraped across the prominent nervures on the upper surface of the opposite or right wing. In our Brit- isii FJcasfjonura viridisshna it appeared to me that the serrated nervure is rubbed against the rounded hind corner of the opposite wing, the edge of which is thick- ened, colored brown, and very yharp. In the right wing, but not in the left, there is a little plate, as transparent as talc, surrounded by nervures, and called the speculum. In Ephippiger vitium^ a member of this same family, we have a curioiis subordinate modification; for the wing- covers are greatly reduced in size, but " the posterior part of the pro-thorax is elevated into a kind of dome over the. Fig. 12.—Chlorocaslus Tanana (from BatesV a. b. Lobes of opposite 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, booksubj, booksubjecthumanbeings
