44 PATAGONIAN EXPEDITIONS! ZOOLOGY. 



1880, p. 503 ; Scl. &Salv. Voy. Chall. II. Birds, p. 107 (1881) ; Burm. 



An. Mus. Nac. Buenos Aires, III. part X, p. 247 (1888: Patagonia); 



Scl. & Huds. Argent. Orn. III. p. 124 (1889) ; Tristr. Cat. Coll. B. 



p. 51 (1889 : Puerto Bueno) ; James, New List Chil. B. p. 9 (1892) ; 



Scl. P. Z. S. 1892, p. 472 (breeding). 

 Bernicla chiloensis, Phil. &Landb. An. Univ. Chile, XXI. p. 427 (1862) ; 



iid. Arch. f. Nat. 1863, p. 149 (Chiloe) ; Scl. Ibis, 1864, p. 421; 



Phil. & Landb. Cat. Av. Chil. p. 40 (1868). 



Anser poliocephalus, Schl. Mus. Pays Bas VI. Anseres, p. 101 (1866). 

 Chestnut-breasted Goose, Cunningh. Ibis, 1868, p. 127. 

 Chloetrophus poliocephalus, Bann. Proc. Acad. Philad. 1870, p. 131. 

 Anser (Brenthus] poliocephalus, Reichen. Orn. Centralbl. 1882, p. 36. 

 Branta poliocephala, Hartert, Kat. Vogelsamml. p. 227 (1891). 

 Bernicla (Chloephaga) poliocephala, Oust. Miss. Sci. Cap Horn, Oiseaux, 



p. 192 (1891). 



GENERAL DESCRIPTION. 



Size. 7814, P. U. O. C., adult male, Pacific slope of Cordillera, 

 Patagonia, 8 March, 1897. J. B. Hatcher. 



Total length, about 23.50 inches. 



Wing, 13.4. 



Culmen, 1.15. 



Tail, 5.1. 



Tarsus, 2.7. 



The female is a little smaller than the male. 



Color. General color; much as in rubidiceps, save that the head and 

 neck are distinctly pale lead-color. 



Head : Pale lead-color; the forehead and eyelids decidedly white and 

 the upper part of the head paler. 



Neck: Pale lead-color, rather darker than the head and the longer 

 feathers of the nape strongly tinted with chestnut. The lower of these 

 feathers, those nearest the back, are sometimes faintly vermiculated or 

 barred with blackish brown. The lead-colored neck does not shade into 

 the color of the breast or upper back, but terminates definitely. 



Back : Upper back bright chestnut, each feather more or less vermicu- 

 lated with dusky ; this does not show plainly unless the feathers are lifted 

 or ruffled, as the area of chestnut is terminal on each feather for more 



