AVES ANATID^. 435 



Wings : The lesser and median coverts pure white ; the greater wing- 

 coverts being greyish brown on the inner webs and having a bronzy- 

 greenish gloss with a metallic sheen on the outer webs ; each feather is 

 tipped with a narrow terminal margin of white ; the whole forming a well- 

 defined alar speculum. Primaries dark greyish brown ; secondaries pure 

 white ; tertials dark greyish brown. 



Lower parts : Including the breast, the lower parts are barred evenly 

 black and white, except on the belly and about the vent. The lower 

 wing-coverts and axillaries are white ; the under tail-coverts are nearly 

 all white, but there are a few greyish brown feathers to be discovered on 

 careful examination. 



Bill : Black. 



Iris : Dark hazel-brown. 



Feet : Very dark lead-color, almost black. 



Adult female : The adult female is very like the same sex in C. magel- 

 lanica, but has the head and neck light lead-color ; there is no ruddy tinge 

 as in the allied bird. 



Two female birds which are referred to this species, 7819, 7820, P. U. O. 

 C, both young birds of the year more than half grown and fully in feather, 

 present an appearance very like the adult female of C. magellanica, except 

 that the colors are not nearly so ruddy or intense, and the characteristic 

 lead-colored head and neck are noticeable. These birds were collected 

 near Rio Coy, Patagonia, on January 24, 1898. In this same region 

 adults were common, though no females were collected. An adult male 

 in worn plumage was taken the next day and is only to be referred to 

 this species. It is 7818, P. U. O. C, and is more barred beneath than 

 is usual in inoruata. The bird is notable in having one white lateral 

 tail feather on one side of the tail ; there is no white feather on the 

 other side. The bird is not moulting and the normal number of rectrices 

 are present. There is a slight admixture of vermiculated feathers among 

 the under tail-coverts, but the upper tail-coverts are pure white. 



Geographical Range. — Central and southern Chili; the Straits of Ma- 

 gellan ; southern Argentina including all Patagonia. Breeds in the lakes 

 of the interior as well as on or near the sea coast of eastern Patagonia 

 (Hatcher in MS. notes). 



The four geese taken by the naturalists of the Princeton Expeditions, 



