FAMILY ALCIDiE. AUKS, PUFFINS, AND MURRES. 29 



Back, with white spots ; ihrout, white or whitish (immature or winter). 



Ixuvia lumme. Red=throated Loon. 



iSee Xo. 7. 



Back, without distinct white si)()ts ; the feathers, edged with ashy; tlnoat, white or 

 dusky (immature or winter). Gavin arctkus. Black-throated Loon. 



See No. 0. 



* 



Group 3. Wing, over 15 inches long. 



Feet, webhcd; head, black, in adult; head, gray; throat, whitish, in iuiiiiature. 



Urinator imbcr. Loon. 

 See No. 5. 



FAMILY ALCID/E. 

 Auks, Puffins, and Murres. 



Toes, three; no hind toe (hallux); toes, palmate (full 

 webbed) ; nostrils, separate, and not tubular. 



* Group 1. Wing, less than 5 inches long. 



Winter plamaije : Upper parts. Iilark ; miderparts, white. In siumair : Tlie 

 breast, tlii'oal, and sides of tlie liead and neck, sooty brown. /^ 



Alle alle. Dovekie. Little Auk 



See Xo. 17. 





* 



^ 



Group 2. Wing, 5.50 to 6.50 inches long. 



> 



i>ill, parrot likr; underparts, white; back, black: u-;ually a Idack 

 cDll.ir. Fratercida arctka. Puffin. Sea Parrot. 



See No. !l. 



Adult in sninincr : General plumage, black, a wliiic patcli on 

 t\n- shoulder: basal half of the jjreater winj;: coverts (feathers 



'forminj; the wliiic pniili on tin- winu', black. W inter birds have y^ g"^^ 



the nndirparls white, and the npprr part-, bi;uk an<l wliitr. — Zl^v ^ ~^ 



Cepjilms ijrijili . Black (iuillemot. Sea Pigeon. ""^^^v. "^ 



Scr No. 1 I. ': 



Similar to I'.lack ( inilli'mot, bnl li:i- ili<' wing coverts li':itbrr> foriiiiiiirtlie white wing 

 pati-h) entirely white and not with basal half black. 



Iinniatnrr ami wintrr birds (except wing coverts), resembling the Hl.nk (luillenioi. 



Cipplnis iiiaiiiKii. Mandt's (iuillemot. 



S.'f No. IJ. 



• Kor illrerUoiiii for meaHurenient, sco page it. 



