1. COLYMBUS. 501 



1894, p. 228 [N. Norway]; Gollett, Ibis. 1894, p. 2G9, pi. viii. 

 [Norway]; Dresser, B. Eur. \x. Sup pi. p. 418, pi. 722 (1890): 

 Sharpe, Handh. B. Gr. Brit. iv. p. 182, pi. 113 (1807) ; rearson. 

 Ibis, 1898, p. 204 [Novaya Zemlya]. 

 Colymbus glacialis, var. adaaisii, Sicinhoe, P. Z. S. 1863. p. 322 



[Sea of Ochotsk]. ' ^ 



Colymbus torquatiis, var. adamsi, Coues, Keu N. Am. B. p 334 



(1872) ; id. B. N.- West, p. 720 (1874). 

 Uriuator adamsi, Stejn. P. U.S. Nat. Mm. v. p. 43 (1882) ; Baird, 

 Brnv. ^- Midffw. Water-B. N. Amer. ii. p. 450 (1884) ; Stem. 

 Bull. U.S. Nat. Mus. xxix. p. 14 (1885) [Commander Is.], p. 313 

 [Kamschatka] ; A. O. U. Check-l. p. 75 (1886); Bidr/iv. Man. 

 N. Am. B. p. 7 (1887); Townsend, Auk, iv. p. 12 (18S7) [N. 

 Alaska]; Nelson, Rep. N.H.Alaska, p. 30 (1887); MacFarl. 

 P. U.S. Nat. Mus. xiv. p. 416 (1891) [Arctic America]. 

 Colymbus torquatus adamsi, Coues, Key N. Am. B. 2nd ed. p. 790 



(1884). 

 Colymbus glacialis adamsi, Tschusi, Orn. Jahrb. v. p. 145 (1894). 

 Gavia adamsi, Allen, Auk, xiv. p. 312 (1897). 



Adult in hreeding-jjlumage. Similar to C. glacialis, hut at ouce 

 distinguished hy the bill, which is much stouter and of a yellowish 

 or whitish colour, shading into dusky towards the base; the culmen 

 is, moreover, almost perfectly straight from the forehead to the tip, 

 and the angle of the genys is sharply defined, whereas in C. glacialis 

 the culmen is distinctly curved downward and the angle of the'genys is 

 inconspicuous ; the feathers on the throat and upper part of the fore- 

 neck are purplish, like the base of the neck, instead of dark green, 

 and the white edges to the feathers forming the hand across the 

 throat are ralher wider and longer : otherwise this species is perfectly 

 similar to C. rjlacialis. Tail composed of 18 feathers. Total length 

 about 32 inches, culmen from feathers on forehead 3-4-3-7, wfng 

 14-4-14-9, tail 2-6, tarsus 3-3-3-4, outer toe and claw 4-5-4-9.' 



Adult in von-hreedin;/ plumage. Similar to C. glacicdis, but at 

 once distinguished by the shape and whitish colour' of the bill. 



The immature resembles the adult in non-breeding plumage, but 

 the biU is shorter. 



J/ah. Northern parts of North America and Asia as far west as 

 Novaya Zemlya, ranging south in winter to Japan, and occasionally 

 to Norway and the British Islands. 



a. Ad. sk. [North America.] Old Coll. 



b. (5' ad. sk. Fort Simpson, summer. B. R. Ross, Esq 



[P.]. 



c. Ad. head. Fort Simpson, summer ( If. Salvin-Godman Coll. 



Hardisfi/). 



d. Ad. sk. Arctic coast, east of Fort Salvin-Godman Coll. 



Anderson, summer (^R. R. 

 Macfarlane). 



e. Ad.sk. Alaska, summer (.4rfffw(.s). 1I..M.S. ' p:utei-pri.«e.' 



(Type of the species.) 

 /. Ad. sk. Kotzebue Sound, summer Salvin-(iodman Coll, 



(E. IV. Nelson). 

 9, h. S ad. sk. Ilakodadi, Feb. 20 (Ilenson). Seebohm Coll. 

 1. ? imm. sk. Ilakodadi, Jan. 2) (Ifmson). Tweeddale Cidl. 



