NATATORES. 477 



[235.] 1. Uria troile. (Lath.) Foolish Guillemot. 



Genus, Uria, Brisson. 



Foolish guillemot. Edwards, pi. 359, f. 1. Pens., Arct. ZooL, ii., p. 516, No. 436. 



Lesser guillemot. Idem, Suppl., p. 69. Bonap. Syn., 424, No. 373. 



Guillemot a capuchon {Uria troile). Temm. ii., p. 921. 



This bird, according- to the Prince of Musignano, is common on the coasts of 

 the United States in winter. The only American specimens which we have 

 seen, were brought from Hudson's Bay. They do not differ from Spitzbergen 

 ones. 



DESCRIPTION 



Of a specimen killed at York Factory, Hudson's Bay. 



Colour. — Head and front of the neck rich pitch-black. Dorsal plumage and wings 

 greyish-black. Tips of the secondaries and under plumage white ; that colour forming a 

 rounded projection into the black of the neck. Bill and legs black. Margins of the eye- 

 lids and a suture from behind the eye white. In another specimen from the same locality, 

 the eyelids and suture ar^ black, as in U. Brunnichii. 



Form. — Bill longer than the head, considerably compressed ; commissure nearly straight ; 

 mandible acutely notched at the tip. 



In ivinter the under parts of the head and throat are white, and the black of the dorsal 

 plumage loses its brownish tinge. 



Dimensions. 



Inch. Lin. Inch. Lin. Inch. Lin. 



Length, total . . 18 Length of bill . 1 10 Length of tarsus . .1 3 



„ of tail .. .20 „ of bill to rictus .2 11 ,, of middle toe . 1 8 



„ of wing . 7 7 ,, of gonys . .13 ,, of middle nail . 5 



— R. 



[236.] 2. Uria Brunnichii. (Sabine.) BrunnicKs Guillemot. 



Genus, Uria, Brisson. 



" Uria troile. Brunn., No. 109." 



Uria Brunnichii. Sab. Greenl. Birds, p. 538, No. 14 ; Suppl. Parry's First Voy., p. ccix., 



No. 30. Richards. App. Parry's Second Voy., p. 377> No. 37. 

 Guillemot a gros bee {Uria Brunnichii). Temm., ii., p. 924. Bonap. Syn., p. 424, No. 374. 



Brunnich's Guillemot frequents the most remote Arctic American seas that 

 have been visited, Greenland^ and Hudson's Bay, and, according to the Prince 

 of Musignano, it retires to the United States in winter. 



DESCRIPTION 



Of a male, killed on Tern Island, Melville Peninsula, in August. 



Colour. — Top of the head and vpper plumage reddish-black. Head, beneath the level 



