1. COLYMDUS. 487 



III. Upper parts dark asli-brown, each feather 

 margined with greyish ash; size larger, 

 wing 14-15 inches. 



A. Ridge of culmen sliglitly concave, angle 



of genys indistinct (jlacialis, p. 496. 



B. Ridge of culmen almost straight, angle of 



genys strongly marked adam.si, p. 500. 



1. Colymbus septentrionalis. 



Le petit Plongeon, Brisso??, Oni. vi. p. 108, pi. x. fig. 2 (1760). 



Le Plongeon a gorge ronge, Brisson, Orn. yi. p. Ill, pi. xi. fig. 1 

 (1760) ; D'Aubent. PL Enl. ix. pi. 55 [no. 308]. 



Colymbus lumme [Gmm. Act. Nidr. i. pi. ii. fig. 2 (1761); Brilnn. 

 dm. Bor. p. 39 (1764)]. 



Colymbus borealis [Briinn. Orn. Bor. p. 39 (1764)] ; Lath. Ind. Orn. 

 ii. p. 801 (1790) ; Vieill. N. Diet. d'Hist. Nat. xxvii. p. 115 (1818). 



Colymbus stellatus ^Briinn. Orn. Bor. p. 39 (1764)] ; Gmd. S. N. i. 

 pt. ii. p. 587 (1788) ; Lat/i. Ind. Orn. ii. p. 800 (1790). 



Colymbus septentrionalis, Linn. S. N. i. p. 220 (1766) ; Gmel. S. N. 

 i."^pt. ii. p. 586 (1788) ; Laf/t. Ind. Orn. ii. p. 801 (1790) ; Tenun. 

 Man. (VOrn. p. 602 (1815) ; Vieill. N. Did. d'llist. Nat. xxvii. 

 p. 115 (1818) ; Temm. Man. d'Orn. ed. ii. p. 916 (1820) ; Stepfi. 

 in Sliaw's Gen. Zool. xii. pt. ii. p. 238 (1824) ; Vieill. Gal. Ois. ii. 

 p. 206, pi. 282 (1825) ; Werner, Atl. Ois. d'Bur. Ord. 15, p. 94 

 (1828); S'wai'is. £,• Richards. Faun. Bor.-Amer. p. 476 (1831); 

 Selby, Brit. Orn. ii. p. 414, pis. Ixxviii. & Ixxviii.* (1833); Schinz, 

 Nat. Ahbild. Viiff. p. 360, pi. 129 (1833) ; Nilss. Skand. Faun. ii. 

 p. 501 (1835) ; Aud. Orn. Biuc/r. iii. p. 20, pi. 202 (1835), v. p. 625 

 (1839) ; Gould, B. Fur. v. pi". 395 (1837) ; Kdrner, Skand. Fogl. 

 p. 22, pi. 61. Hgs. 3% 3" (1839-46) ; Keys. ?*. Bias. Wirhelth. p. 236 

 (1810) ; Demid. Vol/. liuss. Merid. iii. p. 505 (1840) ; Schinz, 

 Furoj}. Faun. i. p. 357 (1840) ; Benoit, Orn. Sicil. p. 175 (1840) ; 

 Cara, Orn. Sard. p. 201 (1842) ; Boiiteille, Orn. Dauphine, ii. 

 p. 321, pi. 71. fig. 3 (1843) ; Aud. B. Amer. vii. p. 299, pi. 478 

 (1844) ; G. R. Gray, List of B. pt. iii. p. 148 (1844); Miihle, 

 Beitr. Orn. Griechenl. p. 135 (1844) ; G. R. Grai/, Gen. B. iii. 

 p. 6.']1 (1848) ; Deyl. Orn. Europ. ii. p. 493 (1S49) : Reichmb. 

 Natatores, pi. 10, nos. 44-48 (1850); Middend. Sibir. Reise, ii. 

 pt. ii. p. 239 (1851) ; Thomps. Nat. Hist. Irel. iii. p. 203 (1851) ; 

 Macgill. Brit. B. v. p. 301 (1852) ; Kjcerboll. Danm. Fiu/le, p. 406, 

 pi. Ii. B., Suppl. pi. 34 (1852) ; Waiters, N. Hist. B. Irel. p. 223 

 (18.53); Heiiyl. Vdg. N.O.-Afr. p. 68 (1856): Sunder. Svensk. 

 For/l. pi. 58. iiu-. 1 (1856) ; Jaubert l^ Lapimim. Rich. Orn. p. 413 

 (1859); Schrenck, Reis. Amur-l. i. p. 496 (1859) ; Walker, Ibis, 

 1860, p. 167 [Bellot Straits, Arctic America] ; Cooper c^- Suckl. N. 

 H. Wash. Terr. p. 279 (1860) ; Baird, B. NA^ner. p. 890 (1860) ; 

 Poicys, Ibis, I860, p. 349 [Epirus & Albania] : Reinhardt, Ibis, 

 18()1, p. 14 [(Greenland] ; Godman, Ibis, 1861, p. 92 [N. Norway] ; 

 Coues, P. Ac. Philad. 1862, p. 228 ; Ross, Nat. Hi.st. Rev. 1862, 

 p. 290 [Mackenzie R.] ; Radde, Ost-Sibir. ii. p. 382 (1863) ; Swinh. 

 P. Z. S. 1863, p. 322 [S. coast of China] ; Blaki.-it. Ibis, 1863, p. 154 

 [Brit. N. America] ; Sivinh. Ibis, 1863, p. 433 [Formosa] ; Wright, 

 Ibis, 1864, p. 156 [Malta] ; More, ibis, 1865, p. 448 ; Newton, Ibis, 

 1865, p. 517 [Spit-bergen] ; Goidd, B. Gt. Brit. v. pi. 45 (1865); 

 Deyl. S( Gerbe, Orn. Europ. ii. p. 594 (1867); Schl. Mus. Pat/s- 

 Bas, vi. Urinat. p. 32 (1867) ; Whiteb/, Ibis, 1867, p. 208 [Hako- 

 dadi]; Coues, P. Essc.r Inst. v. p. 309 (1868) [New England]; 

 Collett, Vid. Selsk. Forh. Christ. 1868, p. 191 ; Bi oun, Ibis, 1868, 



