URIA. 17 



1.20-1.40, gonys .55-.60, depth of bill at nostril .40-.42. Egg 2.41 X 

 1.64. Hab. Coasts of the North Pacific, from southern California to 

 the Aleutian Islands, and across to Kamtschatka and northern Japan. 



29. C. columba PALL. Pigeon Guillemot. 

 a 2 . No white on wings. 



b l . 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 Japan to Sea of 

 Okhotsk, Kurile Islands, and Bering Island (accidental ?) ; Unalashka ? ? 



C. carbo PALL. Sooty Guillemot. 



b 2 . 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 BENICK. Black-winged Guillemot. 



GENUS URIA BRISSON. (Page 10, pi. II., fig. 2.) 



Species. 



COMMON CHARACTERS. 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 secondaries 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. 

 Egg 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 1 . Depth of bill at angle less than one-third the length of the culmen ; top of head 

 and hind-neck smokj^ 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. 1 (Length 15.00-18.00.) 



b\ 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 X 1-99- Hab. Coasts of the North Atlantic, 



1 Such specimens constitute the U. ringvia BRttNN., 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. 



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