BIRDS OF NORTH AND MIDDLE AMERICA. 743 



more grayish; "bill black, very compressed, with prominent gonyd- 

 eal protuberance, bent tip, and feathered as far as above nostrils;" 

 legs and feet yellowish brown in dried skins (probably vermilion 

 red in life); exposed culmen, 42; commissure, 54; bill from anterior 

 end of nasal fossa, 24; tarsus, 36." 

 Greenland; Iceland; Cumberland Gulf. 



Uria motzfeldi Benicken, Isis, Aug., 1824, 889 (Greenland). 



Cepphus motzfeldi Stejneger, Proc. U. S. Nat. Mus., vi, Aug. 5, 1884, 210, 227, 

 229 (crit.). — Baird, Brewer, and Kidgway, Water Birds N. Am., ii, 1884, 

 497. — American Ornithologists' Union, Check List, 1886, 349 (Hypo- 

 thetical List, no. 2); 2d ed., 1895, 325 (Hypothetical List, no. 2); 3d ed., 1910, 

 369. 



C[epphus] motzfeldi Ridgway, Man. N. Am. Birds, 1887, 17. 



Alca viansfeldi Seebohm, Birds Japanese Emp., 1890, 276, in text (Greenland). 



Uria unicolor Faber, Isis, Sept., 1824, 981 (Iceland). — Brehm, Isis, 1826, 988 

 (Greenland); Handb. Vog. Deutschl., 1831, 985. — Schinz, Eur. Faun., i, 

 1840, 360.— ScHLEGEL, Rev. Crit., 1844, 106.— Bonaparte, Cat. Parzudaki, 

 1856, 12. 



[Uria] unicolor Bonaparte, Compt. Rend., xlii, 1856, 774. 



Grylle carbo (not Cepphus carbo Pallas, 1826) Bonaparte, Cat. Met. Ucc. Eur., 

 1842, 82. 



Cepphus carbo Newton, Ibis, 1865, 518, part (Iceland). 



Alca yrylle (not Colymbus grylle Linnaeus) Schlegel, Mus. Pays-Bas, vi, no. 33 

 (Urinatores), 1867, 20, part. 



Una grylle Kumlien, Bull. U. S. Nat. Mus., no. 15, 1879, 104, part (Cumberland 

 Gulf). 



CEPPHUS CARBO Pallas. 



SPECTACLED GUILLEMOT. 



Adult in breeding plumage. — "Bill long and stout, much more robust 

 than in U. [i. e. C] columha. General color deep slaty black, somewhat 

 paler on the underparts and inclining to brown on the shoulders, under 

 wing-coverts, and axillaries; orbital region white, extended pos_ 

 teriorly toward the ear-coverts; feathers above the nasal opening 

 and on the chin and thi'oat inchning to whitish. Tail composed of 

 14 feathers. Total length about 14.5 inches [ = 368.3 mm.], culmen 

 from feathers on forehead to tip 1.65 [ = 41.9 mm.], from gape to tip 

 2.15-2.2 [54.6-55.9], greatest depth of both mandibles at base 0.5 

 [12.7 mm.], wing 7-7.6 [177.8-179.3], tad 1.85-2.1 [47-53.3 mm.], 



« Measurements reduced from inches and lines (Hamburg measure) to millimeters, 

 by Dr. Stejneger. It is clear, from the measurements given, that this little-known 

 bird can not be a phase of U. grylle, as so many have conjectured. The measurements 

 are all much too large, and correspond closely with those of C. carbo. Someone hav- 

 ing the opportunity should examine and carefully describe the type, if it can be 

 found, and the specimens (presumed to be the same species) iii the Leydeu and Brit- 

 ish Museums; at the same time ascertaining whether they possess 12 or 14 rectrices, 

 and thereby determining whether more nearly related to C. grylle or C. carbo. For 

 a complete history of this bird see Stejneger, Proc. U. S. Nat. Mus., \ii. 1884. 210-216. 



