BRITISH BIRDS. 203 



Wings rather short ; tail very short. Legs short, placed 

 veiy much behind; tarsus compressed; front t toes fully 

 webbed ; hind toe small. 



366. Colymbus glaeialis, Linn. GREAT NORTHERN 



DIVER. 



Hab. N.W. Europe and N.E. America. 



Adult : above black, spotted in transverse rows with 

 white ; throat and neck black, upper throat with a violet 

 gloss and a band of ten or twelve short longitudinal 

 streaks ; lower throat glossed with green and with a band 

 of about eighteen streaks ; below white, streaked with 

 black on upper breast ; bill black ; iris red. Length 

 about 29*00; wing 13*50. Young: feathers above dusky 

 with greyish margins ; below whitish ; bill pale brown. 



Of fairly common occurrence on our coasts from autumn 

 until late spring. It is believed to breed in some of the 

 Shetlands. 



367. Colymbus adamsi, Gr. YELLOW-BILLED DIVER. 

 Hab. Circumpolar regions, breeding far north. 



One was shot near Lowestoft in 1852, another (believed 

 to be obtained in the county) is figured in Babington's 

 "Birds of Suffolk," a third, killed in Northumberland, is 

 in the Newcastle Museum, while it has recently been 

 proved (Zool., 1896, p. 14) that a fourth was killed on 

 Hickling Broad in 1872 by the late E. T. Booth. 



368. Colymbus aretieus, L. BLACK-THROATED DIVER. 

 Hab. Northern Palaearctic and Nearctic regions. 

 Adult : above blackish, barred on mantle and back 



and spotted on wings with white ; head and nape grey ; 

 chin and throat black, with a rich purplish sheen, and 

 with a band of white streaks below chin ; below white, 

 streaked with black on sides of upper breast ; bill black ; 



