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Show J>A R\\'INJHM CIIAI'. will serve to llltvtntte this difference; whi ch i ~ frcqncntly much greater :tnd modifi ed in :w e ndl c~s variety of .w:tyK (Fia. 22). Numbers of species of pigeon ~, h:twlu;, fin che , warbler·, ducks, a11d inn11m er·alJle oLhcr birds possess this class of marking. ; and they correspo11cl so exactly in general character wiLh Cursorius chalcoptcrus. C. gallicus. Fw. 21..-Sccondary quills. those of the mmnmalitt, already described, that we cann oL doubt they serve a similar purpose.1 Those birds which arc inhabitants of tropicn1 forests, n ncl which need recognition marks that . ·hall be at all tillt<'s 'vi. ible among the den. e foliage, and not solely or chidly during flight, ha.ve usually small but brilliant patches of co lottl' 1 The principle of coloming for recognition wn. , T hdieve, firHt HLI!I'•l in my article on "'l'he Colours of A 11 i mal:> and Pl:tniH" i 11 M ac11t illan ':> Jlfur;rr.~j,,, ., an<l more fully in my volume on 'l'l'()piml Nnl'nre. f3u l,scqnctttly .Mrs. ll:n·IH'I' gave 11 few exa mples under the lt ead of "Jn<licntivc or B:mttcr Colours," J,ttf, sh' applie<l it to the (]isiin r:t ivc colours of tltc 111al c:> of l>irtls, wlti ch I explain on auother priuciplc, though ihit~ may assist, VIII ORIGIN AND USES OF COLOUR IN ANIMALS Fro. 22,·-St:olopax megala (upper). S. stenura (lower), Q |