BIRDS OF NORTH AND MIDDLE AMERICA. 789 



[?] Fratercula arctica . . . var. glacialis Clarke (W. E.), Zoologist, 1890, 46 

 (Jan Mayen Land; crit.). 



Mormon glacialis Naumanv, Isis, 1821, 782, j)!. 7, fig. 2. 



Mormon arcticus (not Alca arctica Linnteus) Malmgren, Journ. fur Orn., 1865, 

 267 (Spitzbergen).— Walter, Journ. fiir Orn., 1890, 245, 252 (e. Spitz- 

 bergen).— Clarke (W. E.), Ibis, 1899, 50 (Whale Point Harbor, Olga Straits, 

 e. Spitzbergen). 



Fratercula arctica Grant, Cat. Birds Brit. Mus., xxvi, 1898, 616, part (Spitz- 

 bergen). 



Fratercula arctica naumanni Norton, Proc. Portland Soc. N. II., ii. May 20. 1901; 

 144, footnote, 145, pi. 2, fig. 3 (Spitzbergen; coll. U. S. Nat. Mus.); 

 Auk, xxxiv, 1917, 206. — American Orxittiologists' Union, Check List, 

 3rd ed., 1910, p. 26. 



FRATERCULA CORNICULATA (Naumann). 



HORNED PUFFIN. 



Adults in breeding season (sexes alike). — Pileum uniform grayish 

 brown or drab; entire side of head, inchiding supercihary and supra- 

 auricular regions, white; neck (all round) and entire upper parts 

 uniform black, the throat more sooty, this passing into brownish gray 

 on chin; under parts, including lower foreneck, immaculate white; 

 under wing-coverts brownish gray; tip of bill, to between second and 

 third grooves, salmon-red along culmen and gonys, elsewhere brownish 

 red; basal portion of bill (including first ridge and basal maxillary 

 lamina, clear light chrome yellow (in Hfe) ; rictal rosette, bright orange ; 

 tongue and interior of mouth bright orange; iris brownish gray; eye- 

 lids vermihon red, the soft appendages brownish black; legs and feet 

 deep vermilion red. 



Winter plumage. — Bill differently shaped, being broader through 

 middle than at base, the deciduous nasal cuirass, basal lamina, etc., 

 having been shed, all this basal portion dusky, instead of yellow; the 

 rictal rosette greatly reduced and pale yellow instead of red ; supercil- 

 iary horn-like appendage absent, and eyelids brownish gray, instead 

 of red; sides of head gray, becoming sooty blackish on orbital and 

 loral regions, and legs and feet much paler red. 



Young. — Similar in coloration of plumage to winter adults but bill 

 very different, being much less deep, the culmen much less arched, 

 the terminal portion of both maxilla and mandible destitute of grooves 

 or ridges, and horn color or brownish, without reddish tinge. 



Downy young. — Uniform dark sooty grayish brown, the breast and 

 upper abdomen, rather abruptly, white. 



Adult male.—Wmg, 170-187.5 (181.4); tail, 60-68 (64.1); culmen, 

 46-55 (50.6) ; greatest depth of bill, 35.5-50 (43.6) ; tarsus, 27-30 

 (27.9) ; middle toe, 40-44 (41.3) .« 



« Seven specimens. 



