Young Male after the first moult. Plate CXCVII. Fig. 2.
At this age the colours of the male are paler and duller, but are similarly distributed. There is an admixture of yellow tints on the back, and more especially on the rump.
Young Male fully fledged. Plate CXCVII. Fig. 3.
In its second plumage the young male is of a dull green colour mixed with brown above, greyish-yellow, tinged with green beneath, the sides of the head over the eyes greenish-yellow, and the rump and upper tail-coverts of the same colour.
Adult Female. Plate CXCVII. Fig. 4, 4.
The upper parts are greyish-brown, tinged with green, the rump dull greyish-yellow; the sides of the head and neck of the same colour as the back; the under parts pale greyish-yellow, brighter on the fore part of the breast.
Young Female fully fledged. Plate CXCVII. Fig. 5.
The young female resembles the old one, but has less yellow on the rump and under parts.
I have carefully compared skins of the American bird with others of that found in Scotland, but have not succeeded in detecting any differences sufficient to indicate a specific distinction.