138 BLACK-THROATED DIVEE. 



the black on the throat is at first varied with some white 

 feathers. 



The female is a little less than the male. 



In the hird's first year, the head and neck on the back 

 are grey; throat, white; back, deep brownish grey, margined 

 with lighter grey. 



At the next inoult the head and nape become purer grev, 

 and some black feathers shew themselves on the hind part of 

 the neck. The back becomes darker, and a few black feathers 

 become apparent here also. 



The full plumage is not attained till the end of the thud 

 year. 



