FAMILY aLCID.K. AUKS, PUFFINS, AND MURKES. 



31 



* Group 3. Wing, 6.50 to 7.50 inches long. 



^ 



Bill, parrot like; underp.irts, white; back, bhic-k, iisii.illy a black 

 ar. Fmterailu arctica, ajicl races. Puffin. Sea Parrot. 



See No. !t. 



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

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

 formiirj^ the wliitc patcli on the shoulder), black. NViiiter birds 

 have the uuderparts white, and the upper pluina^e, mixed l)Iack, 

 gray, and white. Cepphus (jryUc. Black Guillemot. 



See No. 11. 



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

 basal iialf black. Cepphus mamltii. Mandt's Guillemot. 



See No. 12. 



Summi'r plumnfte : Head, back, wings, and tail, sooty brown ; underparts and tips of secon- 

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

 or blackish about the throat, belly, and tlanks. Uria lomvia. Brunnich's Murre. 



See No. 14. 



Summer plumar/e: Head and neck, back, wings, and tail, black; tips of 

 secondaries and rest of uuderparts, white. Wilder piJumacie : Similar, but 

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



. See No. 15. 



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



Summer plumar/e : Head and neck, back, wings, and tail, black. Tips of seeondarifs .-uid 

 rest of underparts. white. Alca tarda. Razor=billed Auk. 



See No. 1.5. 



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

 secondaries, white. Winter plumage: Underparts, white, nioi-i' or less marked with sooty 

 brown or blackish aliout the throat, bellj^, and flanks; bill, usually over 1.60. 



Urin troile. Murre. 

 See No. 18. 



Similar to Uria troile. but has the head darker than the throat; bill, usually under 1.(50. 



Uria lomvia. Brunnich's Murre. 



See No. 14. 



* For directions for measurement, see page 9, 



