of the United States. 365 



Inhabits the Arctic seas, migrating during the winter to 

 the temperate shores of North America and Europe : very 

 rare and accidental in the United States, where the young 

 only have been observed. 



307. Lestris parasitica, Boie. Bill one inch and a halflong, 

 straight, broad at base, entire ; middle tail feathers very long, 

 still wide one inch and a half from the tip, abruptly narrow- 

 ing, slender and acute at the point ; tarsus one inch and three 

 eighths long, protuberances obsolete. 



Adult blackish-brown, neck and beneath white, the former 

 tinged with yellow. 



Young wholly brownish. 



Arctic Gull, Lath. Die Polm'eue, Lepechin's Reise. 

 Th. 3. S. 224. t. U. 



Inhabits the Arctic seas, migrating during winter on the 

 temperate shores of North America and Europe. Rare, and 

 the young only occasionally seen near the United States. 



C. 



Bill of several pieces. Nostrils tubular. Feet 3-toed, 

 or in place of the hind toe, a sharp nail. 



Tubinares, III. Syphorini, Vieill. Ranz. Procellaria, 

 Boie, Syphonorhini, Blainville. 



* A sharp hind nail. 



Procellaria, auct. Procellaria, Pachyptila, 111. Temm. 

 Ranz. 



67. THALASSIDROMA.* 



Procellaria, L. Briss. Gm. Lath. III. Cuv. Vieill. Ranz. 



* This genus and Puffinusare not mentioned in our Analytical Table, as 

 we considered them subgenera of Procellaria, but hare since decided to 

 adopt them aa genera. See note (26.) 

 Vol. II. 40 



