4l8 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



GENERAL DESCRIPTION. 



Size. Adult male. Total length, about 28.0 inches. 



Wing, 16.5. 



Culmen, 1.7. 



Tail, 6.2. 



Tarsus, 3.2. 



The adult female is appreciably smaller than the adult male. 



Color. Adult male. General color white, with black primaries and 

 tail and dark brown and green markings on the wings. 



Head : White throughout. 



Neck : Entirely white. 



Back : Mantle, lower back, rump and upper tail-coverts white. Anterior 

 scapulars white with a brown median mark. Posterior scapulars dark 

 brown, with a strong washing or gloss of dark green. 



Wing : Upper wing-coverts and lesser coverts white. Lesser median 

 coverts white ; the greater median coverts dark blackish green, with a 

 purple gloss, forming a speculum ; the innermost of these coverts as well as 

 the tertials dark glossy green. Primaries black. Secondaries chiefly white. 



Lower parts : Wholly white, including the lower tail-coverts, the lower 

 wing-coverts and axillaries. 



Iris: "Grey-brown" (Phil. & Landb.). 



Bill: "Cinnabar-red, with the nail black" (Phil. & Landb.). 



"Tarsus, feet, and membranes cinnabar-red, with the nails black" (Phil. 

 & Landb.). 



The adult female is like the adult male in color. 



Geographical Range. Western South America, from Bolivia and Peru 

 southward to the Straits of Magellan. Recorded from Sandy Point, Pata- 

 gonia. 



Mr. Hatcher did not observe this goose, nor was it procured by the 

 other naturalists of the Princeton Expeditions. It is preeminently a bird 

 of Chili and occurs in the Straits of Magellan even as far east as Sandy 

 Point, where it must probably, however, be regarded as casual. 



CHLOEPHAGA HYBRIDA (Molina). 



Anas hybrida, Moll. Sagg. Stor. Nat. Chile, p. 213 (1782), 2nd ed. p. 198 

 (1810). 



