222 LIBIDO. 



addition a few huge smears. One egg is fractured, and cannot 

 be measured, The other two measure respectively 2-8 by T97; 

 2-83 by 1-95. 



3. Tasmania. Gould Coll. 



Genus LEUCOPHJEUS, Brucfi. 



Leucophseus scoresbyi (Traill). 

 (Plate XVIII. tig. 1.) 



Larus scoresbii, Abbott, Ibis, 1861, p. 165. 



Leucophaeus scoresbii, Saunders, Cat. Birds B. M. xxv. p. 299 (1896). 



Leucophaeus scoresbyi, Sharpe, Hand-l. i. p. 143 (1899;. 



The eggs of the lled-billed Gull in the Collection vary in shape 

 from broad to elongated oval. The ground is of an olive-buff 

 colour, and this is marked evenly all over with spots and blotches 

 of yellowish and chocolate-brown and underlying pale purple. 

 They measure respectively : 2*3 by 1*7 ; 2-35 by 1*6 ; 2'46 by 1-tio ; 

 2-3 by 1-75. 



2. Falkland Islands (C. C. Abbott). Gould Coll. 



2. Falkland Islands (Dr. Deane). Saunders Coll. 



Genus PAGOPHILA, Kaup. 

 Pagophila eburnea (Phipps). 



Larus eburneus, Thien. Fortpflanz. ges. Vog. tab. xc. fig. 2, a-c (1845-54) ; 

 Seebohm, Brit. Birds, iii. p. 337, pi. 50 (1885) ; Collett, Ibis, 1888, 

 p. 440, pi. xiii. ; Seebohm, Eggs of Brit. Birds, p. 115, pi. 32. tig. 3 

 (1896). 



Pagophila eburnea, Dresser, Birds Eur. viii. p. 349 (1877) ; Baird, 

 Brewer $ Ridgw. Water Birds N. Am. ii. p. 198 (1884) ; Saunders, 

 Cat. Birds B. M. xxv. p. 301 (1896) ; Sharpe, Hand-l. i. p. 143 

 (1899). 



The eggs of the Ivory Gull in the Collection are of a broad oval 

 form, pointed at the smaller end. Three are of a pale stone- 

 colour, rather sparingly marked with dark brown of various shades 

 and numerous conspicuous blotches of pale inky-purple. Two 

 others have the ground buff, and they are boldly marked with spots 

 and rather large blotches of deep brown, but the underlying markings 

 of pale purple are less conspicuous than in the other eggs. Five 

 examples measure from 2'15 to 2'36 in length, and from 1-63 to 

 1'75 in breadth. 



1. Northern Europe. Old Collection. 



2. Spitsbergen, Aug. (Foscie). Seebohm Coll. 



2. Cape Mary Harmsworth, Franz F. G. Jackson, Esq. [P.], 

 Josef Land, 7th Aug. 



