326 BIRDS/ PALMIPEDES. 



in the middle, and channelled beneath ; length of the bill 4 inches, 

 and from 1 to 4 lines, according to the age. 27 to 29 inches long. 

 Inhabits Arctic Regions. B. Shaw, xii. pi. 61. 



C. &rcticus, JLin. Black-throated Diver. Head and nape brown 

 cinereous ; throat black, with violet reflections ; back, rump, and 

 flanks black, without spots ; scapulars banded transversely with 

 12 or 13 white bands ; upper mandible slightly bent upwards ; the 

 middle of the lower mandible of the same breadth with the base, 

 without grooves below ; length of the bill 3 inches 3 to 6 lines. 

 24to26 incheslong. Arctic Regions. B. Penn. Brit. ZooL ii. pi. 30. 



C. septentrionalis, Lin. Red-throated Diver. Sides of the head, 

 throat, and sides of the neck, mouse-coloured ; top of the head 

 with black spots ; occiput, posterior and inferior part of the neck 

 with longitudinal black and white bands ; on the fore part of the 

 neck a long band of bright chestnut; breast and lower parts white; 

 flanks and upper parts blackish brown ; bill straight, slightly bent 

 upwards ; edges of both mandibles bent inwards ; length of the 

 bill 2 inches 10 lines or 3 inches. 21 to 24 inches long. Inhabits 

 Arctic Regions. Penn. Brit. Zoo/, ii. pi. 30. 



Gen. 20. URIA, Briss. Tern. Colymbus and Alca, Lin. 



Bill middle-sized, or short, stout, straight, pointed, compressed ; 

 upper mandible slightly bent towards the point, the lower 

 forming an angle more or less open ; nostrils basal, lateral, 

 concave, longitudinally cleft, half-closed by a broad mem- 

 brane covered with feathers, and pervious ; legs short, placed 

 far behind ; tarsi slender ; only three toes before, entirely 

 webbed ; wings short. 



The Guillemots, like the Divers, inhabit the northern seas, are little fitted for mov- 

 ing on land, and seldom venture on shore except in breeding time, or when impel- 

 led by tempests. During the rigour of their native climates, they migrate south- 

 wards, along the coasts of some of the countries of Europe. They dive with great facili- 

 ty, and swim nimbly under water. They breed in company, in the holes of rocks, each 

 female laying only one large egg. They moult twice a-year, and the complete win- 

 ter plumage of the sexes is the same ; nor do the young materially differ in their 

 markings from the mature birds. 



* Bill longer than the head. 



U. troile f Lath. (Colymbus troile, and Colymbus minor, Gmel.) 

 Foolish or Lesser Guillemot. Upper parts velvety-black, slight- 

 ly cinereous ; lower parts white ; bill much compressed in its 

 whole length, longer than the head ; wings of an uniform colour, 

 but the secondaries tipped with white; legs dusky. 15 to 17 

 inches long. Northern Europe. "B.Sharv, xii. pi. 62, fig. I. 



U. Brunnichii, Sabine. Body fuliginous ; breast and abdomen snow 

 white ; secondary quills white on the tip j bill dilated, broad at 

 the base, as long as the head ; wings with the secondary feathers 

 tipped with white ; legs greenish. 18 inches long. Inhabits 

 Northern Ocean. Sham, xii. pi. 62, fig. 2, 



