434 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Color. (Adult male cited above.) General color: similar to C. magel- 

 lanica, but with a barring on the under parts of pure black, varying in 

 extent, often leaving little unbroken white. 



Head : Pure white. In immature birds there is a tendency to grey 

 shading upon the crown. 



Neck : White for the part nearest the head and for a varying distance ; 

 then barred with concentric rings of black, very narrow at first, but widen- 



FlG. 222. 



Chloephaga inornata, adult male, 78 1 7, P. U. O. C. Profile showing the barring of black on 

 the breast as well as on the back. About % natural size. 



ing till they are a fifth of an inch broad. These black bars or rings go 

 entirely around the lower portion of the neck from the point where they 

 begin. 



Back : The mantle is barrred evenly with stripes of black and white, 

 which, starting almost as vermiculations, where they begin on the neck, 

 gradually become a quarter of an inch wide. This barring is achieved by 

 feathers which are each barred with from four to six areas of black and 

 white in sharp contrast. The lower back and rump are pure white, there 

 are several dusky feathers mixed among the pure white upper tail-coverts ; 

 the lower tail-coverts are white. The scapulars are dark greyish brown. 



Tail : The tail is wholly black; the outer white rectrices in the tail of 

 magellanica will always serve to determine the adult males of the two 

 species from each other. 



