Vol. x.] lxviii 



which the total absence of pigment extended also to the iris, 

 which thus became pink, and often to the beak and feet as 

 well, and " pied" or partially white-plumaged birds, which 

 had in many cases been at first clothed with a perfectly 

 normal plumage, and in which the partial absence of pigment 

 sometimes appeared after several moults, and was not always 

 quite constant. Such pied aberrations frequently occurred 

 among cage-birds. It was not quite correct to call such 

 pied birds albinos, as was often done by collectors — partial 

 albinos or " leucocisms " would be better determination for 

 such individuals, unless the term "■ pied " could be restricted 

 to such "freaks." 



Mounted Specimens. 

 Apteryx oweni. S. I., New Zealand. Nearly all white. 



Apteryx australis. S. I., New Zealand. Head and neek 

 white. 



English Pheasants. One silvery-grey, one steel-blue, one 

 whitish variety. 



Genn.<eus albocristatus. $ . Nepal. Brownish white. 



Tetrao urogallus. $ ad. Russia. Body and wings white, 

 with black spots. 



? ad. Akmolinsk. White, with black bars to the 

 feathers ; chest uniform white. 



Tetrao tetrix. g ad. Orenburg. Remiges and rectrices 

 mostly pure white. 



<S ad. Olanitz. Almost the entire underside white. 



S ad. Russia. (Leadenhall Market.) Pied ; the 

 wings with a great deal of white. 



£ ad. Perm. Silvery grey. 



$ ad. Twer, Russia. Greyish white. 



$ ad. Russia. Pure white. 



? ad. Russia. Grey, buff, and black in curious 

 mixture. 



Lagopus scoticus. $. Scotland. Buff and white variety. 



