PVGOPODES— COLYMIUD.K 240 



COLYMBIDiE. 

 Divers; toes united by wcl) ; plumage harder than in 

 Grebes; tail short but visible; bill long and pointed ; oceanic 

 in winter, breed on inland lakes; food, fish obtained by 

 diving; eggs generally 2, placed near water's edge, olivaceous 

 brown or green blotched with blackish brown. 



COLYMBUS. 



Characters as above. 



Colymbus immer Brunnich. Great Northern Diver. 

 Fr. Plongeon imbrin ; Ger. Eis-Seetaucher ; Ital. Strolaga 

 maggiore ; Sioed. Islom. 



$ 9 summer. Above black spotted with white, on scapulars 

 barred ; head, throat and hind neck purplish black, foreneck 

 green ; a collar of white and black streaks and a row of same 

 on throat ; underparts white, flanks black with white spots. Bill, 

 ridge of upper mandible shghtly curved downwards, keel of lower 

 mandible slightly upcurved, black, whitish at tip. Outer side 

 of legs and outer toe black, inner side of legs and inner toes 

 pale grey blue, webs dark brown, paler in middle. Iris dark 

 red. In winter: brown above with grey margins, beneath white. 

 Young like adults in winter. Wing 330-390. Tarsus 80-97. Bill 

 75-90. Tail 18 or 20 feathers. 



Jireeds. — Iceland, Jan Mayen, Greenland north to 70° and 

 across N. America. Seen in most seasons but not breeding in 

 Norway, Kanin Peninsula and f\aroes. In winter, ranges south 

 to British Isles and Coasts of W. Europe, Azores, Madeira ; very 

 rare in Baltic and Black Seas ; occasional in Mediterranean ; in 

 America ranges south to Lower California and Florida. 



Colymbus adamsi Gray. White-iulled Northern 

 Diver. 



r{ 9 Resemble " C. immer " but ridge of upper mandible 

 straight and keel of lower mandible much curved upwards ; 

 bill larger and straighter, whitish yellow ; white spots and 

 bars on back are larger; tail iS feathers. Wing 370-400. Bill 

 80-95 (H.). 



