AVES CHIONIDID^. 235 



Straits of Magellan: Falkland Is.); Des Murs in Gay's Hist. Chil. 

 Zool. I. p. 389 (1847); Gould, P. Z. S. 1859, p. 95 (Falkland 

 Islands); Scl. P. Z. S. i860, p. 386 (Falkland Is.); Abbott, Ibis, 

 1861, p. 154 (Falklands, resident); Scl. & Salv. Ibis, 1869, p. 284 

 (Dungeness Spit, Feb.) ; Cunningh. Nat. Hist. Str. Magell. p. 262 

 (1871); Vincig. Patag. p. 59 (1883); id. Boll. Soc. Geogr. Ital. (2) 

 IX. p. 798 (1884) ; Burm. An. Mus. Nac. Buenos Aires, III. part X. 

 p. 246 (1888: South Patagonia: Tierra del Fuego : Falkland 

 Islands) ; Oust. Miss. Scient. Cap Horn, Oiseaux, pp. 288, 330 

 (1891) ; Sharpe, Cat. Bds. Brit. Mus. XXIV. p. 710 (1896) ; id. Hand- 

 list Bds. I. p. 145 (1899) ; Salvad. Ann. Mus. Genov. (2) XX. p. 624 

 (1900: Rio Gallegos, July) ; Martens, Hamburg, Magalh. Sammelr. 

 Vog. p. 15 (1900). 



General description. 



S/2e, Adult: — Total length, 15 inches. 



Wing, 8.8 inches. 



Culmen, 1.3 inches. 



Tail, 4 inches. 



Tarsus, 1.75 inches. 



Color, Adjilt. — Pure snowy white throughout: "bill black, with the 

 base of both mandibles sulphur-yellow or greenish yellow, in some horny 

 reddish or of the pale colour of the human finger-nail ; face bare, covered 

 with milky-white papillae ; from the fore part of the crown a narrow band 

 continued to the angle of the culmen and from the angle of the gape 

 beneath the eyes bare ; feet bluish dusky ; iris reddish dusky ; eyelids 

 bare with white papillae." (J. R. Forster). 



Geographical Range. — That of genus. 



Though common in the Straits of Magellan, the Snowy Sheathbill was 

 not obtained by the naturalists of the Princeton University Expeditions 

 to Patagonia. The fine series of this bird in the British Museum of Nat- 

 ural History as well as specimens in the American Museum in New York 

 and in the collections of the Philadelphia Academy of Natural Sciences 

 have together formed a basis for the description given. The color of the 

 bare and exposed parts of the face and about the bill can only be real- 



