5O2 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Anas cyanorhyncha, Licht. Ms. Hartl. Verz. Ges. Mus. p. 121 (1844). 



Anas ferruginea, Burm. Syst. Uebers. III. p. 440 (1856). 



Erismatura vittata, Phil. Arch. f. Nat. p. 26 (1860: Chili); Scl. P. Z. S. 



1867, p. 335; Phil. P. Z. S. 1868, p. 531 ; Salvad. Cat. B. Brit. Mus. 



XXVII. p. 450 (1895); Sharpe, Hand-list B. I. p. 227 (1899). 

 Biziura ferruginea, Schl. Mus. Pays Bas, VI. Anseres, p. 10 (1866). 



GENERAL DESCRIPTION. 



Size. Adult male in the British Museum (d. Province of Santiago, 

 Chili). 



Total length, 17 inches. 



Wing, 5.7. 



Culmen, 1.7. 



Tail, 3.5. 



Tarsus, 1.2. 



The adult female is on the average somewhat smaller than the male 

 and wholly different in color. 



Color. (Adult male.) General color : Chestnut of a bright tone, with 

 a black head. 



Head : Shining black. 



Neck : Above black like the head ; the chin and upper throat black ; 

 lower part bright chestnut. 



Back : Bright red chestnut, including rump and upper tail-coverts. 



Tail : Deep brown, with chestnut shading ; the feathers shading to 

 darker at their bases. 



Wings : Deeper brown than the back ; the scapulars like the back ; the 

 upper coverts deep brown, the median coverts washed strongly with chest- 

 nut ; under wing-coverts slaty, tipped with white ; axillaries slaty, edged 

 with whitish. 



Lower parts : Breast, sides and flanks bright reddish chestnut, like the 

 back ; the breast color shades insensibly into the silvery lower surface, the 

 feathers of the abdomen being deep grayish brown, with silvery white or 

 gray tips almost obscuring the base color ; under tail-coverts white, gen- 

 erally with a strong wash of chestnut. 



Bill: Dull gray-blue. 



Iris : Dark red in the breeding season ; deep hazel-brown at other times 

 of year. 



