FAMILY ALCID.K. - - AUKS, PUFFINS, AND MUKUES. 



31 



Group 3. Wing, 6.50 to 7.50 inches long. 



Bill, parrot like; underparts, white ; back, black, usually a black 

 collar. Fnitercttla arctica, and races. Puffin. Sea Parrot. 



See No. 9. 



Adult in summer: General plumage, black; a white patch ou 

 the shoulder; basal half of the greater wing coverts (feathers 

 forming the white patch on the shoulder), black. Winter birds 

 have the uuderparts white, and the upper plumage, mixed black, 

 gray, and white. Cepphus yrylle. Black Guillemot. 



See No. 11. 



n 



Similar to the Black Guillemot, but has the wing coverts entirely white and not with 

 basal half black. Cepphus mandtii. Mandt's Guillemot. 



See No. 12. 



Summer plumage : Head, back, wings, and tail, sooty brown ; uuderparts and tips of secon- 

 daries, white. Winter plumage: Underparts, white, more or less marked with sooty brown, 

 or blackish about the throat, belly, and flanks. Una lomoia. Brunnich's Murre. 



See No. 14. 



Summer plumage : Head and neck, back, wings, and tail, black; tips ol 

 secondaries and rest of underparts, white. Whiti / plumage : Similar, but 

 has the throat white. Alca torda. Razor=billed Auk. 



See No. 15. 



* Group 4. Wing, 7.50 to 8.50 inches long. 



Summer plumage: Head and neck, back, wings, and tail, black. Tips of secondaries and 

 rest of underparts, white. Alca torda. Razor=billed Auk. 



See No. 15. 



Summer jilnmage : Head, back, wings, and tail, dark sooty brown; underparts and tips of 

 secondaries, white. Winter /iJ /image: Uuderparts, white, more or less marked with sooty 

 brown or blackish about the throat, belly, and flanks; bill, usually over 1.60. 



Uria truile. Murre. 

 See No. IS. 



Similar to Uria troilc, but has the head darker than the throat; bill, usually under 1.60. 



Uria lomnin. Brunnich's Murre. 



See No. 14. 



* For directions for measurement, see page 9 



