424 
Sy nopsis 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 ; summer plumage, 
whole head jet black. 
Young duller, no black stripe behind the eye. 
Lesser and Foolish Guillemot , Lath . Buff. pi. enl. 903. 
summer dress. Foolish Guillemot , Edw. Glean, pi. 359. fig* l. 
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 brunn ichii, 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. nec 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. ME RG ULUS. 
Mergulus , Ray Vieill. Boie. Brehm. Uria, Lath. Alca, 
L. Gm. Cephas, Cuv 
Bill very short, a little curved, conic-convex, hardly com- 
pressed, nearly as broad as high : both mandibles notched ; 
upper slightly sulcated : nostrils rounded ; tongue thick, 
entire : smallest of the Order. 
11 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. 
