of the United States. 423 



SUBGENUS I. URIA. 



Colymbus, L. Gm. Alca, Lath. Uria, Cuv. Vieill. Boie. 

 Bill longer than the head, straight, compressed, subulate, 

 perfectly smooth. Nostrils linear. 



* Lower mandible straight along its edge to a small 

 notch at tip. 



Cephas? Cuv. Genus Grylle? Leach? 



Colors black, changing greatly in moulting. Not adult 

 before the fourth year. Eggs one or two. 



37i. Uria grylle, Lath. A large white space on the mid- 

 dle of the wings; feet red. 



Summer plumage entirely black, wing coverts white; win- 

 ter, black, cheeks and beneath white. 



Black Guillemot, Ediv. pi. 50. back Jig. summer dr. Spot- 

 ted Greenland Dove, Id. I. c. front Jig. moulting ind. Uria 

 grylle, balthica, grylloides, lacteola, auct. Uria grylle, Vieill. 

 Gal. des Ois. pi. 294. ad. 



Inhabits the north of both continents : not uncommon 

 during winter along the coasts of the United States. 



37-2. Uria marmorata, Lath. Brown, undulated with ches- 

 nut; beneath dusky, spotted with white ; feet orange; bill 

 black, one inch long. 



Marbled Guillemot, Lath. Syn. vi. p. 336. pi. 96. Young 

 of Uria grylle, Vieill. 



Inhabits the north-western coasts of America, and the oppo- 

 site shore of Asia. 



** Both mandibles curved at the point. 



Uria, Leach ? 



Colors beneath white at all times ; the throat only chang- 

 ing from black to white in moulting. Young obtain the adult 

 plumage in the second year : lay but one egg. 



