URIA, 17 
1.20-1.40, gonys .55-.60, depth of bill at nostril .40-.42. Egg 241 X 
1.64. Hab. Coasts of the North Pacific, from southern California to 
the Aleutian Islands, and across to Kamtschatka and northern J apan. 
29. C. columba Pau. Pigeon Guillemot. 
a?, No white on wings. 
b'. A whitish area surrounding the eye; plumage otherwise dark sooty. 
(Winter plumage and young unknown.) Length about 14.50, wing 
about 7.75, culmen 1.55-1.70, gonys .75-.80, depth of bill at nostril .50. 
Hab. Coasts of northeastern Asia, from northern J apan to Sea of 
Okhotsk, Kurile Islands, and Bering Island (accidental ?); Unalashka ?? 
C. carbo Paty. Sooty Guillemot. 
6%. No white anywhere, the plumage entirely dark sooty ; about the size of C. 
carbo. Hab. High north Atlantic (Iceland, Greenland, and west side of 
Cumberland Gulf). —. C. motzfeldi Bznicx. Black-winged Guillemct. 
Genus URIA Brisson. (Page 10, pl. IIL, fig. 2.) 
Species, 
Common Cuaracrzrs.—Culmen as long as or longer than the tarsus; bill much 
compressed, the gonys more or less concave, and nearly as long as the culmen; cutting- 
edge of upper mandible notched near tip, its basal portion more or less thickened or 
swollen; a distinct longitudinal furrow in the feathering behind eyes; upper parts 
uniform dusky, the sécondaries sharply tipped with white; lower parts white. 
Summer plumage: Sides of head and neck, chin, throat, and fore-neck, uniform 
velvety brown. Winter plumage: Chin, throat, fore-neck, and sides of head and 
‘neck white, with a dusky stripe behind eye. Young: Similar to winter plumage, 
but no white on side of occiput, and that of fore-neck faintly mottled with dusky ; 
bill smaller. Downy young : Head, neck, and upper parts smoky grayish brown, the 
head and neck finely streaked with dingy whitish ; lower parts whitish centrally. 
gg as large as that of a goose, elongate or ovate pear-shaped, and excessively vari- 
able in color, the ground-color varying from white to cream-color, pinkish, pale 
blue, and yellowish green (the last two colors probably most common), and varie- 
gated with variously-formed marks of black and brown. 
a. Depth of bill at angle less than one-third the length of the culmen; top of head 
and hind-neck smoky brown; basal portion of cutting-edge of upper mandible 
always dusky or similar in color to rest of the mandible. Summer plumage : 
Sides of head and neck, chin, throat, and fore-neck, velvety smoky grayish 
brown, sometimes marked with a narrow white postocular line, connected 
with a white ring around eye.” (Length 15.00-18.00.) 
bY. Wing 7.75-8.30 (7.99), culmen 1.70-1.90 (1.81), gonys 1.05-1.20 (1.14), depth 
of bill through angle .50-.60 (.52), tarsus 1.40-1.60 (1.51), middle toe 
1.60-1.75 (1.70). Egg 3.26 1.99. Hab. Coasts of the North Atlantic, 
1 Such specimens constitute the U. ringvia Brittrn., by some authors considered a distinct species, and pos- 
sibly entitled to such rank. Its proper status is a matter of doubt, and is a fit subject for special investigation. 
Such specimens are only known from the North Atlantic. 
3 
