UlilA. 17 



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



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



the Aleutian Islands, and across to KanUschatka and northern Ja)iau. 



29. C. columba Pall. Pigeon Guillemot. 



a'. No white on wings. 



b'. A whitish area surrounding the ej-e ; plumage otherwise dark sooty. 

 (Winter plumage and j'oung unknown.) Length about 14.50, wing 

 about 7.75, culmen 1.55-1.70, gonys .75-.S0, depth of bill at nostril .50. 

 Mab. Coasts of northeastern Asia, from northern Japan to Sea of 

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



C. carbo Pall. Sooty Guillemot. 



6'. No white anywhere, the plumage entirely dark sooty ; about the size of C. 



carbo. Hah. 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 moi'o 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 jAumage:- 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 duskj-; 

 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 e.xcessivelj' vari- 

 able in color, the ground-color varjang 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 duskj- 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 ej'e.' (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, 



' Such specimens conatitnte the V. ringvia BrOnn., 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 



