The descent of man, and selection in relation to sex . Fig. 68. Tragelaphus scriptus, male (from tho Krowsley Menagerie). row white vertical lines on their hinder flanks, and anelegant angular white mark on their foreheads. Bothsexes in the genus Damalis are very oddly coloured; inD.])ygarga the back and neck are purplish-red, shadingon the flanks into black, and abruptly separated from the Chap. XVIII. EQUAL TRANSMISSION. 301 white belly and a large white space on the buttocks;the head is still more oddly coloured, a lari>e oblono^white mask, narrowly-edged with black, covers the faceup to
The descent of man, and selection in relation to sex . Fig. 68. Tragelaphus scriptus, male (from tho Krowsley Menagerie). row white vertical lines on their hinder flanks, and anelegant angular white mark on their foreheads. Bothsexes in the genus Damalis are very oddly coloured; inD.])ygarga the back and neck are purplish-red, shadingon the flanks into black, and abruptly separated from the Chap. XVIII. EQUAL TRANSMISSION. 301 white belly and a large white space on the buttocks;the head is still more oddly coloured, a lari>e oblono^white mask, narrowly-edged with black, covers the faceup to the eyes (fig. 69) ; there are three white stripeson the forehead, and the ears are marked \\ith fawns of this species are of a uniform pale yellow-. Fiir. eg Damalis pjgarga, male (from the Knowsley Menagerie). ish-brown. In Damalis alhifrons the colouring of thehead differs from that in the last species in a singlewhite stripe replacing the three stripes, and in the earsbeing almost wholly white.^^ After having studied to 2 See the fine plates in A. Smiths Zoology of S. Africa, and Gleanings from the Menagerie of Knowsley. 302 SEXUAL selection: mammals. PartIL the best of my ability the sexual differences of animalsbelonging to all classes, I cannot avoid the conclusionthat the curiously-arranged colours of many antelopes,though common to both sexes, are the result of sexualselection primarily applied to the male. The same conclusion may perhaps be extended to thetiger, one of the most beautiful animals in the world,the sexes of which cannot be distinguished by colour,even bv the dealers in wild beasts. Mr. Wallacebelieves^^ that the striped coat of the. tiger so assi- milates with the vertical stems of the bamboo, as to
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Keywords: ., boo, bookcentury1800, bookdecade1870, booksubjectnaturalselection
