740 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Vogel der Arktis, 1904, 124 (synonymy, range, etc.). — Eifrig, Auk, xxii, 

 1905, 235 (Hudson Bay northward ; North Devon; Cape Fullerton; food; descr. 

 eggs). 



C[epphus] mandtii Ridgway, Man. N. Am. Birds, 1887, 16. 



Grylle mandtii Fritsch, Nat. Vog. Eur., 1870, 496; Atlas, 1871, pi. 59, fig. 4. 



mUria meisneri Brehm, Lehrb. Eur. Vog., pt. ii, 1824, 1006 (Greenland). 

 l^]Cephus meisneri Brehm, Handb. Vog. Deutschl., 1831, 989. 



Uria glacialis Brehm, Handb. Vog. Deutschl., 1831, 991 (Arctic Europe). 



Uria grylle, var. glacialis Sundevall, Vog. Scand., Atlas, livr. iv, 1847, pi. — . 



Uria grylle v. glacialis Malmgren, Journ. fiir Orn., 1865, 261 (Spitzbergen). 



C[epp^us] g[rylle\ mandtii Hantzsch, Journ. fiir Orn., Jan., 1908, 143, 144, in text. 



Cepphus grylle mandtii Hantzsch, Journ. fiir Orn., July, 1908, 311 (Labrador; crit.) 



CEPPHUS COLUMBA Pallas. 



PIGEON GUILLEMOT. 



Similar to C. grylle, but under wing-coverts brownish gray instead 

 of pure white, white wing-patch divided below by a broad wedge- 

 shaped bar of black, rectrices 14, instead of 12, and size larger. 



Adults in breeding ylumage (sexes alike). — General color plain 

 fuscous-black, the tips of scapulars and interscapulars more slaty, 

 the rump and upper tail-coverts uniformly more slaty (between 

 dark mouse gray and u'on gray), the under parts and anterior portion 

 of head more sooty (between clove brown and bone brown) ; posterior 

 lesser wing-coverts, middle coverts, and tips of greater coverts white, 

 the white tips to the last becoming gradually broader on proximal 

 coverts until from about the middle of the series the black is quite 

 concealed and the white blends with that of the middle and lesser 

 coverts, which also are dusky beneath the surface; axillars and under 

 wing-coverts brownish gray, paler toward edge of the wing, the inner- 

 miost post-carpal coverts mostly dull white, the third series from 

 secondaries broadly tipped with dull white; bill black; interior of 

 mouth vermilion red; iris dark brown; legs and feet vermilion red, 

 claws black. 



V/inter plumage. — Wings and tail as in summer; rest of plumage 

 pure white, the pileum, back, scapulars, and upper part of rump 

 with feathers blackish for concealed and part of exposed portions; 

 legs and feet paler red. 



Young. — Similar to the winter plumage, but white of wing-coverts 

 tipped with dusky, secondaries and primaries with terminal spots of 

 white, rump and under parts indistinctly barred with dusky, and 

 pileum with less of black. (Readily distinguishable from young of 

 C. grylle and 0. rnandtii by the brownish gray, instead of pure white, 

 axillars and under wing-coverts.) 



Downy young. — Plain dark sooty grayish brown, darker on an- 

 terior portion of head, paler and more grayish on abdomen. 



