Archive image from page 326 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele1874darw Year: 1874 Piff. 10. Taphro- deres distortus (enlarged). Up- per figure, male; lower figure, female. We Lave liere a curious and inexplicable CAf< of dimorphism, for some of the females of four European species of Dysticus, and of certain species of Hydroporus, have their elytra smooth; and no «intermediate gradations between the sulcated or punctured, and the quite smooth elytra have been observed. See Dr. H. Schaum, aa quoted in the ' Zoologist,' vols, v-
Archive image from page 326 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele1874darw Year: 1874 Piff. 10. Taphro- deres distortus (enlarged). Up- per figure, male; lower figure, female. We Lave liere a curious and inexplicable CAf< of dimorphism, for some of the females of four European species of Dysticus, and of certain species of Hydroporus, have their elytra smooth; and no «intermediate gradations between the sulcated or punctured, and the quite smooth elytra have been observed. See Dr. H. Schaum, aa quoted in the ' Zoologist,' vols, v-vi, 1847-48, p. 1896. Also Kirby and Spence, Introduction to Entomology,' vol. iii, 1826, p. 305. f Westwood, Modern Class.,' vol. ii, p. 193. The following statement about Penthe, and others in inverted commas, are taken Crom Mr. Walsh, Practical Entomologist,' Phila., vol. iii, p. 88 \ Kirby and Spence, ' Introduct.,' etc., vol. iii, pp. 333-336.
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