179 



fourtb. Adult: — Head, neck, jngulum, and entire upper parts uniform 

 plumbeous-black, the bases of the feathers pure white ; this somewhat 

 exposed on the occiput and nape. Tail deep black, crossed at about the 

 middle of its exposed portion by a narrow zone of white, and anterior 

 to this by narrower and less complete bands of the same. Lower parts, 

 from the jugulum back, white, narrowly barred with black over the 

 entire surface. 



This very rare, and, so far as regards the coloration of the lower parts, 

 somewhat aberrant, species, we have not seen, and consequently draw up 

 our diagnosis from the characters furnished by its describers. 



