498 COLTMBIDJE. 



Jarrell, Hist. Brit. B. iii. p. 320 (1843) ; Knox, Zoologist, (2) iv. 

 p. 1603 (1869) [habits]. 



L'lmbiim des Mers dii Nord, D'Aubent. PL Enl. ix. pi. 54 [no. 952] ; 

 Bvff. Hist. Nat. Ois. viii. p. 258, pi. xxii. (1781). 



Inibe'r Diver, Pennant, Arct. ZooLii. p. 618 (1785) ; Lath. Gen. Syn. 

 iii. pt. ii. p. 340 (1785) ; id. Gen. Hist. x. p. 87 (1824). 



Northern Diver, Pennant, Arct. Zool. ii. p. 518 (1785); Lath. Gen. 

 syn. iii. pt. ii. p. 377 (1785) ; id. Gen. Hist. x. p. 84 (1824). 



Mer'aus glacialis, Botmat. Tabl. Encycl. M6th. i. p. 70, pi. 19. fig. 1 

 (1790). 



Mergu.s immer, Bonnat. Tabl. Encycl. Mith. i. p. 72 (1790). 



Uriiiator glacialis, Lacep. ^ Davdin, in Buff. Hist. Nat. (18mo Didot), 

 Qiwdr. xiv. p. 311, Ois. xvi. p. 179, pi. 14 (1799) ; Schaloio,J.f. O. 

 1895, p. 461 [W. Greenknd]. 



Uriuator \n\mex. Lacep. l<f Daudin, in Buff. Hist. Nat. (18mo Didot), 

 Quadr. xiv. p. 310, Ois. xvi. p. 171 (1799) ; Stej,i. P. U.S. Nat. 

 Mns. V. p. 43 (1882) ; Buird, Breio. ^ Ridijtv. Water-B. N. Amer. 

 ii. p. 446 (1884). 



Cepphus torqiiatus, Pallas, Zooyr. Rosso-As. ii. p. 340 (1811). 



Cepphus imber, Pallas, Zooyr. Rosso-As. ii. p. 344 (1811). 



Colymbus byemalis, Brehm, I^ehrb. Eur. Vog. ii. p. 883 (1824) ; 

 id. Handh. Vog. Deiitschl. p. 972 (1831). 



Colymbus maximus, Brehm, Handh. T^oy. DeutscM. p. 971 (1831). 



Loon or Great Northern Diver, Ntitt. Man. Orn. p. 513 (1844). 



Eudytes glacialis, Namn. Nat. Vog. Deutschl. xii. p. 397, pi. 327 

 (1844) ; Bau,etc. J.f. 0. 1877, p. 341 [Germany]. 



Colymbus glacialis, var. torquatus, Ridyiv. Ann. Lye. N. York, x. 

 p. 392 (1874) [Illinois]. 



Colymbus adarasi, Babbinyton {nee G. R. Gray), B. Suffolk, p. 24G, 

 pi. vii. (1886). 



Colymbus arcticus, Slater ^ Carter, Ibis, 1886, p. 51 [North Ice- 

 land]. 



Uriuator imber, A. O. U. Check-l. p. 75 (1886) ; Evermann, Auk, iii. 

 p. 88 (1886) [Ventura Co., Cal] ; Seton, Auk, iii. p. 147 (1886) 

 [W. Manitoba]; Lloyd, Auk, iv. p. 184 (1877) [W. Texas]; 

 Ridyic. Man. N. Am.^B. p. 7 (1887) ; Nelson, Rep. N. H. Alaska, 

 p. 35 (1887) ; Warreii, B. Pemisyl. p. 3 (1888) ; Merrill, Auk, v. 

 p. 140 (1888) [Oregon] ; Chapman, Auk, v. p. 268 (1888) [Florida] ; 

 Ererni. Auk, v. p. 345 (1888) [Indiana]; Scott, Auk, v. p. 373 

 (1888) [Gulf of Florida]; Bretvst. Auk, v. pp. 389, 390(1888) 

 [Massachusetts]; Chamberl. Avk, \\. p. 212 (1889) [S. Green- 

 land] ; Clarke, Auk, vii. p. 3i:"0 (1890) [Hudson Bay] ; Loomis, 

 Auk, viii. p. 55 (1891) [S. Carolina]; MacFarl. P. U.S. Nat. 

 Mus. xiv. p. 416 (1891) [Arctic America] ; Hatch, B. Minnesota, 

 p. 10 (1892) ; Mackay, Auk, ix. p. 292 (1892) [migration] ; 

 Mcllwraith, B. Ontario, ed. 2, p. 30 (1894) ; Merrill, Auk, xiv. 

 p. 354 (1897) [Idaho]. 



Gavia imber, Allen. Auk, xiv. p. 312 (1897) ; Grinnell, Auk, xv. 

 p. 124 (1898) [Sitka]. 



Adult in breeding-jjlumage. General colour above glossy black, all 

 the feather.? truncate and ornamented with twin pairs of quadrate 

 white spots, which are largest on the scapulars ; wing-coverts, lower 

 back, rump, sides, and flanks like the back, but the white spots are 

 rounded and much smaller. Head and neck black, with a purplish 

 shade on the crown, changing into dull green on the sides of the head 



