BLACK GUILLEMOT 489 
a narrow alar bar; front of neck,' breast, abdomen, and 
under tail-coverts, white. 
Adult female nuptial.—Similar in plumage to the male. 
Adult winter, male and female.—The feathers of the 
throat, cheeks, and chin, are white, but this species ‘‘ appar- 
ently does not assume the white patches on each side of 
the occiput” (W. R. Ogilvie-Grant, Cat. Birds Brit. Mus., 
VOW: XXV1,,p: 579); 
Immature, male and female. — Resembles the adult 
winter-plumage. 
Brak. Black with a white line without feathers? along 
the lower edge of the upper segment (tomia maxillary) from 
the nostrils to the gape. 
Ferret. Brownish. 
TIr1pEs. Dark brown. 
Kee. Thicker and blunter than that of the Common 
Guillemot, but very like it in markings : clutch, one. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... 19 in. Female smaller. 
WING si... aie Sot = AOD es 
BEAR? ae TES) ns 
'TARSO-METATARSUS digs Aa 
EGG 3°25 x 2 im 
BLACK GUILLEMOT. Uria gryiile (Linneus). 
Coloured Figures.—Gould, ‘Birds of Great Britain,’ vol. v, pl. 
49; Dresser, ‘ Birds of Europe,’ vol. viii, pl. 623; Lilford, 
‘Coloured Figures,’ vol. vi, pl. 41. 
The Black Guillemot, a bird of rather local distribution, 
differs from other British Auks in many of its habits.4 Far 
from being gregarious, it is seldom seen, even about its 
1 The white in front of the neck terminates in a point, whereas in 
the Common Guillemot the white meets the brown in a rounded arch. 
? In the Common Guillemot this part of the edge of the upper segment 
of the beak is concealed from view by short dense feathers. 
3 Beak of immature bird much smaller. 
4 By some systematists this bird has been separated from the other 
Auks, and has been placed in the Genus Cepphus (Saunders). 
