AYES. 381 



Sp. Mergulus melanoleucits Rat, Brandt, Alca Alle L., Buff. PI. enl. 917; 

 the winter plumage; the summer plumage differs by the head and neck 

 entirely black. (See Brehm Handb. der Natun/esch. aller Yogel Deutscli- 

 lands, 1831, Taf. 45, fig. 3, Naxjmann Tab. 334, fig. i.) This bird lives 

 in high northern latitudes, and also visits our shores in the cold season. 



Uri'a Briss. Bill compressed, moderate or short, not grooved. 

 Nostrils covered by plumules, basal, lateral, pervious. Tarsi 

 resting, covered with an anterior row of scutella. Interdigital 

 membrane excised. 



Brachyrhamphus Brandt. Bill much shorter than head. Feet 

 •weaker. 



Sub-genera Apobafton and Synthlibwamphus Brandt. Sp. Uria antiqua 

 Pall., Schleg. Faun. Japonic, Aves, Tab. 80, Gray Gen. Tab. CLXXVil. ; 

 — l/ria Temminckii nob., Uria Wumizusume Temm. {umisusume?) Faun. 

 Jap., Av. Tab. 79, &c. 



Uria Brandt. Bill acuminate, nearly equalling head in length. 

 Feet stronger. 



Sp. Uria Troile Lath., Colymbus Troile L., Uria lomvia Brunn., Buff. PI, 

 enl. 903, Naumann Tab. 331 ; foolish guUlemot, sea-cool, &c. 



Phalanx III. Colymbides. Wings fitted for flying, with flag- 

 feathers short. Tarsi compressed. Feet tetradactylous. 



Colymhus Lath. (Species from gen. Colymbus L.), Eudytes 

 Illig. Feet palmate. Tarsi reticulate, with hexagonal scales. 

 Pollex short, internal, enlarged by membrane internally. Tail 

 short. Bill moderate, straight. Nostrils oblong, lateral, placed at 

 the base of bill, pervious. 



Sp. Colymhus (jlacialls L., Buff. PI. enl. 952, Lesson Ornith. PL no,, fig. 1, 

 Naum. Taf. 327; head and neck black green, with a white, black-streaked 

 collar, back and wings black with four-sided white spots ; breast and belly 

 white ; the largest species ; like the other species of this genus, it lives in 

 the far north on the coasts of America, Europe and Asia; — Colymbus 

 arcticus L., Buff. PI. enl. 914 (younger bird), Naumann Taf. 328, Gray 

 Gener. PI. CLXXI. ; northern diver, not unlike the preceding, but with grey 

 head and smaller; this species visits our shores in winter. (The young 

 bird of this species has sometimes been described as a distinct species, as 

 has also occurred in the case of the young bird of the preceding species, 

 which was recorded as Colymbus immer by Gunner, Stroem, Brunnich, 

 &c. and received by Linnaeus into his Systema nat.) — Colymhus septentrio- 

 nalis L., Buff. PI. enl. 308, Naum. Taf. 329; on the back black, below 

 white, with a brown-red throat. These birds feed principally on fish; they 



