SCIENTIFIC DESCRIPTION. 



9 



back more greyish-green ; the croup and the upper coverings 

 of the tail are of a pure yellowish-green ; the wings are of a 

 blackish-grey, delicately-edged on the outside with a 

 greenish-grey tint, and having a broad-fallow point ; second 

 wings with a broad, grey, exterior feather and point ; all 

 the fans are underneath of a bright ashen grey ; the upper 

 wing-covers are of a blackish-grey colour, broadly edged 

 with olive-green and yellow ; the lower wing-covers are white; 

 the tail-feathers are blackish- grey, edged with fallow- grey at 

 the outer and inner borders, beneath they are of a brighter 

 grey ; underneath, the whole body is of a vivid greenish- 

 golden hue ; the sides are greenish-yellow, streaked down- 

 ward with a blackish-grey ; the back part of the body is of 

 an almost pure white, as are also the nether tail-covers, the 

 latter, however, have a yellowish reflection (reflex) ; the eyes 

 are brown ; the upper beak of a brownish flesh-colour, while 

 the lower beak is of a yellowish-grey ; the feet and claws of 

 a brownish flesh-colour ; the soles of the feet are of a flesh- 

 coloured white. (I have ascertained that, the older the 

 bird gets, the more will the yellow colour of its plumage, 

 especially at the throat and the lower part of the breast, 

 declare itself ; the brownish colouring at the shoulders and 

 upper part of the back becomes more and more perceptible, 

 while the beak grows more uniformly dark brown and grey. 

 These signs could be positively traced in several living birds 

 which I have before me.) The female bird differs from the 

 male only inasmuch as the greenish-yellow colour is super- 

 seded, especially at the breast and belly, by broad, whitish- 

 grey borders around the feathers, so that it will, on the 

 whole, appear more of a subdued greyish-blue colour with 

 only a tone of greenish-yellow ; the forehead and the streak 

 around the eyes have a slight but vividly greenish-yellow 

 reflex, as has also the whole lower side ; but, beginning from 

 the under part of the breast, the colour is of a tolerably 



