740 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Vogel der Arktis, 1904, 124 (synonymy, range, etc.).—E1rric, Auk, xxii, 
1905, 235 (Hudson Bay northward; North Devon; Cape Fullerton; food; descr. 
eggs). 
Clepphus] mandtit Ripeway, Man. N. Am. Birds, 1887, 16. 
Grylle mandtii Fritscu, Nat. Vog. Eur., 1870, 496; Atlas, 1871, pl. 59, fig. 4. 
{L?] Uria meisneri Brenm, Lehrb. Eur. Vég., pt. ii, 1824, 1006 (Greenland). 
\[?]Cephus meisnert Brrum, Handb. Vég. Deutschl., 1831, 989. 
Uria glacialis Breum, Handb. Vég. Deutschl., 1831, 991 (Arctic Europe). 
Tria grylle, var. glacialis SUNDEVALL, Vég. Scand., Atlas, livr. iv, 1847, pl. —. 
Uria grylle v. glacialis MatmGREN, Journ. fiir Orn., 1865, 261 (Spitzbergen). 
Clepphus] g[rylle] mandtit Hanrzscu, Journ. fiir Orn., Jan., 1908, 143, 144, in text. 
Cepphus grylle mandtii Hantzscx, Journ. fir Orn., July, 1908, 311 (Labrador; crit.) 
CEPPHUS COLUMBA Pallas. 
PIGEON GUILLEMOT. 
Sunilar 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 plumage (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 iron 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- 
most 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. 
Winter 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 C. mandtii 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. 
