of the United States. 
423 
SUBGENUS /. UR1A. 
Colymbus , L. Gm. Alca , Uria , Guv. 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. 
371. 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 , Edw . pi. 50. back fig. summer dr. Spot- 
ted Greenland Dove , Id. 1. c. front fig. 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. 
372. 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. 
