MAMMALS— BEAUTY OF THE QUADRUMANA. 



543 



or natural selection, or was due to the direct action of the condi- 

 tions of life, or to some other unlmown 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 

 flgnres (from Prof. Gervais) are given 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." 



Quadrumama. — Before we conclude, it will be well to add a 

 few remarks on the ornaments of monkeys. In most of the spe- 



« 'Proc. Zool. See' 1862, p. 164. See, also. Dr. Hartmann, 'Ann. d. 

 Landw.' Bd. xliii. b. 222. 



