SISKIN. 



501 



plumage becomes mucli richer towards the season of incuba- 

 tion. The black parts become deeper, and the olive of a 

 yellower green. 



The female is smaller than the male, measuring from four 

 inches and a quarter to three-eighths in length ; the head, 

 back, and upper part of the wings greyish olive brown, 

 streaked with dusky black ; under parts greyish white, 

 streaked with dusky black, and tinged with greenish yellow 

 on the throat and breast. 



Young males after their first moult have the black feathers 

 on the head margined with brown, and the colours, though 

 brighter than those of the female, are not so vivid as those of 

 the adult male. 



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