378 



PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Lower parts : The under neck, as described, white with a median line of 

 black feathers from the throat downward to the much elongated pendant 

 white plumes of the lower neck. 



On either side of the breast and chest a patch of blue black extending 

 back along the abdomen. The middle of the breast apparently streaked 

 black and white, the white feathers being edged with black. The mid- 



FIG. 199. 



FIG. 200. 



Ardea cocoi, adult male. 8638 Princeton 

 University Collection. About \ natural size. 

 La Plata, Argentina, July, 1896. 



Ardea cocoi, adult male. 8638 Princeton 

 University Collection. Details of unfeathered 

 part of leg and foot. About natural size. 



region of the chest and abdomen, the entire thighs and under tail-coverts 

 white. Sides of the body, axillaries and under wing-coverts pale slaty 

 blue. 



Bill : Golden yellow, becoming deeper in color and shaded with horn 

 brown above, at the base 



Iris : Pale straw yellow. The bare skin around the eye pale greenish 

 (F. Withington). 



Legs and feet : Dark olive brown, shaded with yellow. 



The adult female resembles the adult male in color, but the elongated 

 plumes of the several regions are not so strongly developed. 



