URIA. 17 



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

 1.64. Mab. 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. 

 al No white on wings. 



6^ 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. 

 ITab. Coa^s of northeastern Asia, from northern Japan to Sea of 

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



C. carbo Pall. Sooty Guillemot. 



b'^. No white anywhere, the plumage entirely dark sooty ; about the size of G. 



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 witb 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^. 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.^ (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. ^ab. Coasts of the North Atlantic, 



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



