138 BLACK-TIIEOATED DIVER. 



the black on the throat is at first varied witli some whito 

 feathers. 



The female is a little less than the male. 



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

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

 with lighter grey. 



At the next moult the head and nape become pui-er grey, 

 and some black feathers shew themselves on the liind part of 

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

 become apparent here also. 



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

 year. 



