AVES STERCORARIID^. 227 



Huivantazgo, Feuerland, Jan.: Sene Almirantazgo, Jan.); Sharpe, 

 Hand List Bds. I. p. 143 (1899) ; Salvad. Ann. Mus. Genov. (2) 

 XX. p. 629 (1900: Santa Cruz, Patagonia) ; Martens, Hamb. Magalh. 

 Sammelr. Vog. p. 17 (1900); Gates, Cat. Bds. Eggs. Brit. Mus. I, 

 p. 225 (1901). Nicoll, Ibis, 1904, p. 47 (Port Dixon and Gray's 

 Harbor). 

 Lestris antarcticus, var. b. chilensis, Bp. Consp. Av. II. p. 207 (1857). 



General description. 



Size. — Total length, about 21 inches. 



Wing, 15.5 inches. 



Tail, 6.5 inches. 



Culmen, 2.3 inches. 



Tarsus, 2.75 inches. 



Color. — Adult (unworn plumage). General color, upper parts brown 

 with chestnut markings on mantle and whitish striping on the neck. 

 Lower parts reddish chestnut brown. 



Head : Generally brown, deepening to dark brown on forehead, crown 

 and occiput. 



Neck : Above, brown striped with narrow white or greyish streaks, and 

 with chestnut mottling. Under neck including chin and throat warm 

 chestnut, rusty or deep cinnamon. 



Back: Mantle brown, the feathers streaked medianly with rusty red 

 chestnut ; the rump and upper tail coverts chiefly chestnut. 



Wings : Chiefly brown, dark in shade and with suggestions of chestnut 

 on the upper wing coverts. The quills are dark brown ; four of the outer 

 ones with white bases which show most conspicuously from below. 

 Under wing coverts chiefly chestnut. 



Tail : Dark brown. 



Lower parts, chin, throat, breast and abdomen reddish chestnut or deep 

 rusty cinnamon. The under tail coverts chestnut with dark brown mottling. 

 Flanks and sides shaded with dark brown. Bill : Dark reddish umber. 

 Tarsi : Black, frequently mottled with yellowish. Toes : Black ; webs 

 dusky brown. Iris : Dark hazel brown. 



"Male: Straits of Magellan, December, 1879. Bill, legs and feet 

 black ; eyes brown. 



