XANTHOCHROISM— YELLO IV 



1055 



X 



XANTHOCHROISM, the abnormal replacement of another 

 colour, generally green, by yellow, not unfreqnently seen in 

 Parrots ; but said to be often induced artificially (c/. Colour, 

 page 99). 



XENICUS, the generic name ^ of a little bird from Xew Zealand, 

 long known as the Long-legged Warbler (Latham, Synops. ii. p. 465) 

 or Motacilla longipes of Gmelin, and exciting little curiosity until 

 A. W. Forbes shewed {Proc. Zool. Soc. 1882, pp. 569-571) that it, 

 as well as Acanthidositta"^ — the Rifleman of the colonists (suprci 



ACANTHIDOSITTA. 



(From Buller.) 



Xenicus. 



p. 789, note), to which genus it had sometimes been referred — had 

 not the characteristic vocal organs of the OsuiNES, and belonged to 

 the group which Garrod termed Mesomyodi. A', longipes is the 

 Bush- Wren of the colonists, while a second species, their Eock-Wren, 

 A'^ gilviventris, inhabits the Southern Alps. The existence of these 

 two, morphologically-low genera, forming a Family which should 

 rightly be called Acanthidosittldx is a very significant feature in 

 New-Zealand ornithology (c/. Buller, B. N. Zeal. ed. 2, pp. 108-115). 



YAFFIL, YAFFINGALE, variously spelt, names of the Green 

 Woodpecker (page 1046). 



YARWHELP, an old name for the Black-tailed GODWIT when 

 it inhabited this country (r/. Whaup). 



YELLOW, used in combination in the name of many kinds ; 



^ Said by G. R. Gray {Cat. Gen. B. p. 31) in 1855 to liave been bestowed by 

 him in 1853 ; but no publication at that date is known, and the genus was not 

 really described till some years later (/Sis, 1862, p. 218). 



2 Originally miswritten by Lafresnaye {Mag. de Zool. 1842, Ois. pi. 27) 

 Acanthisitta. 



