PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 227 



The true habitat of C. carbo seems to be a very restricted one, 

 beiug confiued to the shores of the Okhotsk Sea and adjacent waters. 

 Specimens in the museum of the Phihidelphia Academy are said to be 

 from Kamtschatka, being in all probability from the western or Okhotsk 

 shore. Kamtschatka has its Okhotsk and its Pacific shores, as America 

 its Pacific and Atlantic shores, and the difference between the two 

 shores are proportionally the same. I doubt very much that C. carho 

 occurs on the Pacific side of Kamtschatka otherwise than accidentally, 

 and I regard the two pairs seen by me at Bering Island in the spring 

 of 1883 likewise only as stragglers. C. carbo is known to breed on the 

 Kurile Islands, at the Bays of Abrek and of Decastrie, and is also 

 reported from Yezo, the northern island of Japan. 



IV. — Synopsis of the species of the genus Cepphus. 



o*. A large white patch on the upper surface of the wing, 

 ft'. Under wing-coverts pure white. 



c^ Greater upper wing-coverts white to the base, only dusky along the 

 basal part of the shafts,* forming no concealed or visible band 

 across the wing-patch. 



1. C. MANDTII. 



c^. Greater upper wing-coverts, black in their basal half or more,* form- 

 ing a concealed or visible black band across the wing-patch. 



2. C. GRYLLE. 



b'^. Under wing-coverts more or less brownish-gray, or smoky, never white. 



3. C. COLUMBA. 



o*. No white on the upper surface of the wing. * 



IK A whitish patch round the eyes. 



4. C. CARBO. 



6^. No whitish patch round the eyes. 



? 5. C. MOTZFELDI. 



1. Cepphus mandtii (Light.) Newt. 



1774. — Colymbus grylle Phipps, Voy. tow. N. Pole (p. 186.) (wecLiN.). — Uria 

 (J. Baer, Bull. Scientif. Ac. St. Petersb. iii, p. 352. — Cassin, in Baird 

 B. N. Amer.,p.911 (1858).— Zd., Pr. Philada. Acad., 1862, p. 323.— Malm- 

 GREX, Ofv. Sv. Vet. Acad. Handl. 1863,p. 111.— If7., Jour. f. Orn. 1863, p. 

 382.— FiNSCii, 2*'= Deutsche N. Polfahrt, p. 221 (1874).— Feilden, Ibis, 

 1877, p. 40.— i&.,P. Z. S.,1877, p. 31.— NoRDQUiST, in Nordeuskj. Vega 

 Exped., Am. ed.,p. 436 (1881).— Nelson, Cruise Corwin,p. 117 (18S3).— 

 Cepphus g. Newton, P. Z. S., 1864, p. 495. 



1822. — Uria mandtii Lichtenst., in Mandt's Obs. Itiu. Dissert, (p. 30). — Id., 

 Doubl. Verz., p. 88 (1823).— Faber, Isis, 1824, p. 980.— Keys. & Blas. 

 Wirbeltb. Eur., I, p. xcii. (1840). — NAUMAXN,Naturgesch. Vog. Deutschl., 

 xii,p. 462 (1844).— Evans & Sturge, Ibis, 1859, p. 221.— Heuglin, J. f. 

 Orn., 1871, p. 102.— Cepphus m. Newton, Ibis, 1-65, p 517.— /rf., ibid., 1869, 

 p. 241.— Gillett, Ibis, 1870, p. 307.— Heuglin, J. f. Orn., 1871, p. 100.— Zd., 

 ibid. 1872, p. 124.— Zrf., Ibis, 1872, p. 64. 



*It will facilitate the determination to pull out one of the feathers. 



