Archive image from page 556 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 MAMMALS—BEAUTY OF THE QUADRUMANA. ;43 or natural selection, or was due to the direct action of the condi- tions of life, or to some other unknown cause, it is impossible to decide. An observation made by Mr. Sclater well illustrates our ignorance of the laws which regulate the appearance and disappearance of stripes; the species of Asinus which inhabit the Asiatic continent are destitute of stripes, not having even Fig. 72. Head of Semnopithecus rubicund
Archive image from page 556 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 MAMMALS—BEAUTY OF THE QUADRUMANA. ;43 or natural selection, or was due to the direct action of the condi- tions of life, or to some other unknown cause, it is impossible to decide. An observation made by Mr. Sclater well illustrates our ignorance of the laws which regulate the appearance and disappearance of stripes; the species of Asinus which inhabit the Asiatic continent are destitute of stripes, not having even Fig. 72. Head of Semnopithecus rubicundus. This and the following fig-ures (from Prof. Gervais) are g-iven to show the odd arrange- ment and development of the hair on the head. the cross shoulder-stripe, whilst those which inhabit Africa are conspicuously striped, with the partial exception of A. tseniopus, which has only the cross shoulder-stripe and generally some faint bars on the legs; and this species inhabits the almost inter- mediate region of Upper Egypt and Abyssinia. Quadrumana.—Before we conclude, it will be well to add a few remarks on the ornaments of monkeys. In most of the spe- 'Proc. Zool. Soc' 1862, p. 164. See, also, Dr. Hartmann, 'Ann. d. Landw.' Bd. xliii. s. 222.
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