AVES CATHARTID,. 553 



Tail, 10.7 inches. 



Tarsus, 2.7 inches. 



This form averages a little smaller than C. aura. 



Fio. 275. 



C. faUdandiau. P. U. O. C. 8998. Showing lower surface. About one-sixth natural sire. 



Color. (Adult male cited above.) Black; averaging darker than in C. 

 aura; the gloss blue-green and^ noticeable particularly on the back, the 

 shoulders, the upper surface of the tail-feathers ; the feathers of the back 

 and interscapular region edged with dull brown ; the secondaries and 

 median wing-coverts edged with whitish of an ashy tone ; this character 

 is very variable and though always present is much more decided in some 

 individuals than in others. Head said to be clear pink in live birds and 

 not bright red as in C. aura. Bill yellowish white ; the tip pure white. 

 Iris hazel-brown. The under parts are slightly glossed with green-black 

 and the crop patch is bare like that of C. aura. 



This comparative description will serve to define this form from its 

 close congener. 



Geographical Range. Southern Chili and Patagonia ; Tierra del 

 Fuego ; the Falkland Islands. 



