ALCID.E — TllK AUKS - ALCA. 



473 



Philad. 

 H. 1881, 



Alca ballhica, HiiirN.N. Oni. Bm. 17ti4, iiS, no. 101 (iiutuuturi', witlmut white line from bill to eye). 



Aliic Hitiniilailu, Biii'sN. t. I', iiu. 102 (youiij;). 



Alat i/l(ii:i(ilin, IlliKll.M, Vdg. Duiilsdil. l^yl, imi. 



Ah-il inliiitiUfil, lillKII.M, t. c, 1U().'<. 



Alcii micrtirlii/nchut, Huiill.M, Vo^'t.'lf. 1855, 410. 



Hau. Coasts mill i.sluuds ol' tLu Nurtli Atlantic, diiwn to alxiiit latitude 10° iii winter. Jaiwn 1 



(fide ScHI.KliKI.). 



A. tarda. 



Sp. Chau. Adult, in summer: Ilrad, nock, and upper parts Mack, tliu head and neck more 

 fuliginous, and chan^'inj,' to soft, velvety snutl'-brown on the under portion ol' the head and lore- 

 neck ; secondaries narrowly tipped with wiiile ; 

 u narrow white line runniufi Irmu the liase of 

 the culnien to the eye. Lower i)arls, inclu<linj,' 

 juj,'idiini, axillars, and linin;^' of the win},', ini- 

 uiacuhite white. Bill Mack, both mandibles 

 crossed about the ndddle by a white line ; 

 "inside of mouth j,'and)o<,'e-yellow ; iris deep 

 huzel ; feet black" (AuuunoN). Adult, in 

 vfinter: Whole under portion of the head, fore- 

 neck, and post-auricular ref,'ion white ; no white 

 line from eye to bill ; bill without basal lam- 

 ina. Otherwise like the summer i)luma;,'e. 

 Ymmy : Similar to the winter plumage, but 

 bill smaller, perfectly smooth, and without the 

 white bur across the middle portion. 



Total length, about 17.<H) inches ; wiu.i;, 

 8.(K) to 8.50; tail, 3.50; culmen, 1.25; jjreat- 

 est depth of bill, .90; tai'sus, 1.25; middle 

 toe, 1.55. 



Summer adult. 



This is a northern and Arctic si)ecies, alninduiit throughout the eastern sliores of 

 North Aniericiu from the highest hititiidea to Maine in summer and to New Jersey in 

 VOL. II. — GO 



m 



