70 



TERN. GULLS. 



The excrements of the Black Guillemot, in xhz Norzvegian (czs,. 

 are of a fcarlet color, occafioned, as is fuppofed, by its feeding on the 

 afcaris verfifellis, or rodaat. 



^16, - . The Caspian Tern has been lately difcovered near Stockholm. It 



returns to the Baltic before the Black-backed Gull. Lays three eggs on 

 the bare rock ; white, thinly painted with black. — Mr. Oedman. 



Mr. Oedman lias confidered the different fpecies of Gulls with more 

 attention and judgment than any other naturalift. On his remarks I 

 make the following corrections of my own miftakeSi and thofe of molt 

 other ornithologifts. 



The Wagel is only a young Herring Gull, not arrived at its full plu- 

 mage. The Silvery, or Larus Argent atus, on the reverfe, is a very old 

 bird of the fame kind, whitened by age and cold. The eggs of the 

 Herring Gull, in Sweden, are darker colored than thofe of England. 



The KiTTiWAKE, or Three-toed Gull, undergoes three alterations of 

 color. In the firft ftage of its life, its plumage is much mixed v/ith. 

 black, and is at that time the fame with my 'Tarrock. 



In its fecond ftage, is the fame with the Kittiwake ; and in the laft, is 

 the fame with the Larus Rijfa. 



The Laughing Gull has been feen only very lately on the- .§«/-- 

 tic fea. 



Mr. Oedman fays, that the Ivory Gull merits the name dl Jnowy^ 

 •from its fuperlative whitenefs.. 



/j2. The Glaucous Gull breeds on the rocks of the Baltic fea, and muft 



be placed among the birds of Sweden. It lays three blueifh eggs, with 



fome large black fpots. They are very fharp at the lefler end. 



The Winter Gull, Br. Zool. II. No. 248, has been difcovered 



to be the young of the common Gull, aot arrived at its full 



plumage,. 



This 



