LAEus. :il7 



Tlircc e^^s of Audouiti's Gull in the Collection have a butt' 

 ground and are pretty thickly spotted and blotched with blackish 

 brown. A fourth is of a kind of creamy-buffi tint, and the mark- 

 ings, which are similar in character to those on the other examples, 

 are of a pale yellowish-brown colour. All four have the usual 

 pale purple underlying markings. They measure respectively : 

 2-4 by 1-75; 2-45 by 1-73; 2 45 by 1-8 ; 2-53 by 1-66. 



]. Columhretes Island, Spain. Saunders Coll. 



1. Columbretea Island, 1st May. Saunders Coll. 



1. Columbretes Island, April. Saunders Coll. 



1. Toro, Sardinia, 25th May (Lord Saunders Coll. 

 Li/furd). 



Larus delawarensis, Onl. 



(Plate XVII. fig. 5.) 



Larus delawarensis, Baird, Breicer ^- Ridr/ic. Water Birdx N. Am. ii. 

 ]). 244 (1884); Saunders, Cat. Birds B. M. xxv. p. 273 (1890); 

 Sharpe, Hand-l. i. p. 142 (1899). 



The two eggs of the Ring-billed Gull in the Collection are of 

 (juito dissimilar types. One is of a regular oval form and has an 

 olive-buff ground, sparingly marked, except at the larger end, where 

 there are huge continent blotches forming an irregular zone, with 

 sj)ots and specks of deep chocolate-brown ; the underlying pale 

 purple markings are few and inconspicuous. The second specimen 

 is a pointed oval and has a light buff ground, boldly marked all over 

 with spots and blotches of blackish brown. The underlying mark- 

 ings on this egg are numerous, large and conspicuous. The two 

 measure respectively : 2-25 by 1*63 ; 2-35 by l"t). 



1. Little Slave Lake, Canada {S. Jones : Salvin-Godman Coll. 



Ilmshaic Coll.). 

 1. Ni)rtli America. Saunders Coll. 



Larus californicus, Lawr. 



(Plate XVIII. fig. 2.) 



Larus californicus, Baird, Brewer cS* Bidr/w. Wafer Birds N. Am. ii. 

 p. 242 (1884); MacFar/ane, Proc. U.S. ^'at. Mns. xiv. p. 418 

 (1891); Sumiders, Cat. Birds B. 31. xxv. p. 276 (1890) ; Shariie, 

 Hand-l. i. p. 142 (1899). 



The eggs of the California Gull in the Collection show con- 

 siderable variation, but can ail be matched by those of L. fmcus, 

 and a larger series would, no doubt, display all the types to be found 

 among the eggs of that species. They measure from 2-45 to 2' 75 

 in length, and from l-7o to 1-85 in breadth. 



1. North America {Smiths. Inst.). Salvin-Godnian Coll. 



1. North America ( r. J/. /?/•?«•«•). Saunders Coll. 



1. North America, ICth May Saunders Coll. 



(R. Ridf/mnj). 



1. Anderson Kiver, Arctic America, Saunders Coll. 



0th July {R. MacFurhute). 



