424 Synopsis of the Birds 



373. Uria troile, Lath. Blackish, beneath white ; seconda- 

 ries white at tip ; feet dusky ; bill longer than the head, much 

 compressed throughout, upper mandible four times as long as 

 broad. 



Adult, a black stripe behind the eyes j summer plumage, 

 whole head jet black. 



Young duller, no black stripe behind the eye. 



Lesser and Foolish Guillemot, Lath. Bvff. pi. enl. 903. 

 summer dress. Foolish Guillemot, Edw. Glean, pi. 359. Jig. 1- 

 summer dress. Uria lomvia, Brunn. Colymbus troile, L. 



Inhabits the Arctic regions of both continents : common 

 during winter on the coasts of the United States. 



374. Uria brunmchii, Sabine. Sooty-blackish, beneath white; 

 secondaries white at tip ; feet greenish ; bill as long as the 

 head, dilated and broad at base, upper mandible three times 

 as long as broad. 



Summer plumage, whole head black. 



Uria francsii, Leach. Uria troile, Brunn. nee auct. 



Inhabits the Arctic seas of both continents : not uncommon 

 during winter on the coasts of the northern and middle states : 

 very numerous in Davis' Straits, Baffin's Bay, &c. 



SUBGENUS II. MERGULUS. 



Mergulus, Ray Vieill. Boie. Brehm. Uria, Lath. Alca, 

 L. Gm. Cephus, Cuv 9* 



Bill very short, a little curved, conic-convex, hardly com- 

 pressed, nearly as broad as high : both mandibles notched ; 

 upper slightly sulcated : nostrils rounded j tongue thick, 

 entire : smallest of the Order. 



* We now adopt the generally received and older name Mergulus, and 

 reject Cephus, which we had heretofore used, principally because Cuvier, 

 who instituted that subgenus, has made an inextricable confusion, by giving 

 as the type Uria grylle, though he probably intended for it this bird. 



