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Show 290 SEXUAL SELECTION: MAMl\t:ALS. P.l.nT If. winter or breeding coat ; so t 11 at ·th':s cas e may be L compared. w.i th t h oso gi·V en m· a P:· evious c..h apter .o f rlosoly-allied or representative species o~ buds w~JC~~ dif1"er from each other only in their nuptial phn~ao0 · The females of Cet·vus paludost~s of S. Amcnca, as well as the young of both sexes, do n~t possess ~he black stripes on the nose, and t.he blackish-brown 1m2~ on the breast which charactense the adult males. Lastly, the mature male of the beautifully coloured a~cl spotted Axis deer is considerably darker, as I ~m mformcd by Mr. Blyth, than t~e female ; and this hue tho castrated malo never acqmres. . rrho last Order which we have to cons1der-for I a~1 not aware that sexual differences in colour oc.cur m the other mammalian groups-is that of the Pnma~es. The male of the Lemur macaco is ?oal-black? whil~t the female is reddish-yellow, but highly varw.ble m co l our. 29 Of the Quadrumana of the New World, ·t hhe females and young of Mycetes caraya are greyis - yellow and alike ; in the second Y?ar the young ~mal,e becomes reddish-brown, in the thud year black, ~xcepting the stomach, which, however, beco~es qmte black in the fourth or fifth year. There IS also a strongly-marked difference in colour b.etween the sexes in Myeetes seniculus and .Cebus capuc~nus ~ the .you~g of the former and I beheve of the latter spemes resembling th~ females. ·with Pithecia .zeucocephala .the young likewise 1:esemble the females, whJCh arc browmsh- 21 ' Ottawa Academy of Sciences,' Mny 2~, 1868, p. 3~ 5. , 2s 8 M"llcr on the Banicn .... • Zoog. Ind1schcn Arch1pel. 1839-18-!l. t b 35. 8~0 also Raffles as q;~ted by Mr. Blyth, in 'Lund and Water,' 1l~G7 ' : 476. On goats: Dr. Gray, 'Cat. Brit. 1\'lus.' p. 146; ?_c<mn.res!, , Ma~;nulo"'ic • p. 4.82. On the Cervus paludosus, Rcn~gcr, 1b1d. s. 3'Ll. 2n Relate~, c'Proc. Zool. Roc.' 1866, p. 1. The same fnct hnr-: also hcc11. fully n.sccrtaincd by MM. Pollen anrl van Dam. CHAP. XVlii. ORNAMENTAL COLOURS. 291 black above and light rusty-reel beneath, the adult males being black. ~rhe ruff of hair round the face of Ateles marginat~~s is tinted yellow in the male and white in the female. Turning to the Old World, the males of Hylobates hoolock are always black, with the exception of a white band over the brows; the females vary from whity-brown to a dark tint mixed with black, but are never wholly black.30 In the beautiful Cercopithecus diana tho head of the adult male is of an intense black, whilst that of the female is dark grey; in tho former the fur between the thighs is of an elegant fawn-colour, in the latter it is paler. In the equally beautiful and curious moustache monkey (Cercopithecus cephus) the only difference between the sexes is that the tail of the malo is chesnut and that of the female grey ; but Mr. Bartlett informs me that all the hues become more strongly pronounced in the male when adult, whilst in the female they remain as they were during youth. According to the coloured figures given by Solo1?on Muller, the male of Semnopithecus cht·ysomelas 1s nearly black, the female being pale Lrown. In the Cercopithecus cynos~wus and griseo·vi1·idis one part of the body which is confined to the male sex is of the most brilliant Llue or b(}'reen, and contrasts strikino1y W'ith the naked skin on the hinder part of the bobd y, which is vivid red. Lastly, in the Baboon family, the adult male of Cynoc~ pl~alus hamadryas differs from the female not only by Ius Immense mane, but slightly in the colour of the hair and of the naked callosities. In the drill (Cynocephalus 80 On Mycctcs, Rcnggcr, ibid. s. 14; and Brehm, 'Illustrirtcs Thierleben,' B. i. s. 96, 107. On Atc:les, Dcsmarcst, 'Mammalogic,' p. 75. ~n IIylobatcs, Blyth, 'Land aucl Water,' 1867, p. 135. On the Semno} nihecus, S. 1\iiilll'l', 'Zoog. lndischcn Archipcl.' tab. x. u 2 |