COLOR-SENSE 87 



coloring of rapacious and carrion birds, on the other hand, 

 is always dull and destitute of any decorative hues. 



With regard to colors in the external coverings of mammals, 

 Grant Allen 44 says: "The whole series, whether among 

 marsupials, pachyderms, Cetacea, ruminants, Carnivora 

 or Insectivora, show almost uniform tints of black, brown, 

 gray or dingy yellow. It is true that many animals, like the 

 zebras, tigers, spotted deer and giraffes, have very notice- 

 able alterations of light and dark shades, but they do not 

 yield us pure spots of green, blue, red or yellow. When 

 we come to the essentially arboreal mammals, however, the 

 tree rodents and the Quadrumana, we get many com- 

 paratively brilliant species. The squirrels are often remark- 

 able for their beautiful colors, and the so-called flying squirrels 

 call for special notice in this respect." 



Darwin, 46 in his Descent of Man, described the various 

 decorative colorings met with in monkeys. He said: 'In 

 very many species the beard, whiskers and crests of hair 

 round the face are of a different color from the rest of the 

 head, and when different are always of a lighter tint, being 

 often pure white, sometimes bright yellow or reddish. The 

 whole face of the South American Brachijurus cakus is of a 

 'glowing scarlet hue'; but this color does not appear until 

 the animal is nearly mature. The naked skin of the face 

 differs wonderfully in color in the various species. It is 

 often brown or flesh-color, with parts perfectly white, and 

 often as black as that of the most sooty negro. In the 

 Brachyurus the scarlet tint is brighter than that of the 

 most blushing Caucasian damsel. It is sometimes more 

 distinctly orange than in any Mongolian, and in several 

 species it is blue, passing into violet or gray. In all the 

 species known to Mr. Bartlett, in which the adults of both 

 sexes have strongly-colored faces, the colors are dull or 



