7 6 



PATAGONIAN EXPEDITIONS : ZOOLOGY. 



This description is based on an adult female no. 7806, Princeton Uni- 

 versity Ornithological Collection, taken on the Pacific Slope of the Cor- 

 dilleras, Patagonia, 16 March, 1897. The collector, Mr. J. B. Hatcher, 

 notes the eyes as "brown with a yellow border." 



Immature birds resemble the adult, but differ in having the sides of the 

 head and face, and the chin and throat white. The sides and fore part of 

 the neck chiefly greyish tinged with chestnut. The sides of the breast 

 and flanks are ashy-brown, without traces of chestnut. 



Young in Down. The general color of the upper parts as well as of 

 the head and neck black, marked with longitudinal stripes of white. 

 FIG. 41. FIG. 42. FIG. 43. 



ALchmopkorus 

 major. 7806. 

 Princeton Univer- 

 sity Collection. 

 Breeding female. 

 Detail of foot. % 

 natural size. 



^Lchmophorus major. 8636. 

 Princeton University Collection. 

 Immature. Buenos Aires. Pro- 

 file of head and neck. natural 



sze. 



jfechmopliorus major. 8635. 



Princeton University Collection. 



Adult female. Winter. Buenos 



Aires. Profile of head and neck. 



natural size. 



These become broken and irregular on the crown and sides of the head 

 where they form a distinct pattern. There is a naked patch on the middle 

 of the crown. Entire lower parts including the throat and chin white. 

 The descriptions of the immature and of the down plumage are taken 

 from material in the British Museum of Natural History. 



The adult male in winter is not so highly colored as in the breeding 

 season and has a white throat and a white area in front of the eye. The 

 adult female in winter resembles the immature bird. 



