BIRDS OF XOKTH AND MIDDLE AMERICA. 



747 



mostly white, but broadly margined terminaUy with fuscous, some- 

 times so broadly as to reduce the white to an irregular spotting, the 

 chest, sides, and flanks sometimes nearly uniform fuscous; axillars and 

 under wing-coverts uniform fuscous; bill black; iris dark brown; 

 legs and feet pale brownish (flesh color in life). 



Winter 'plumage. — Upper parts dusky (dark fuscous), inteniipted 

 b}^ a nuchal band of white, the interscapulars, rump feathers, and 

 upper tail-coverts tipped with gray; scapulars mostly white, espec- 

 ially the inner ones; entire under parts, including malar, auricular, 

 and suborbital regions and lower half of loral region, immaculate 

 white, the sides and flanks m.ore or less striped with dusky grayish; 

 axillars and under wing-coverts uniform fuscous, as in summer. 



Y oung .—AhoYQ^ uniform dusky (fuscous-blackish), the nape 

 somewhat intermixed with white; white scapular patch less distinct 

 than in winter adults; lores almost wholly dusk}'; under parts white, 

 nearly everywhere, but more especially on chest, breast, and sides, 

 transversely mottled with dusky or fuscous; bill smaller and weaker 

 than in adults. 



Adult male.— Wmg, 121.5-129 (126.1); tail, 29-35 (31.3); exposed 

 culmen, 13.5-16.5 (15.1); tarsus, 15.5-16.5 (15.9); middle toe, 23- 

 25.5 (24.3). « 



Adult female.— Wmg, 112-127 (121.7); tail, 28-33 (30.5); exposed 

 culmen, 15-lG (15.4); tarsus, 15-16 (15.5); middle toe, 22-24 (23).^' 



Pacific coast of North America; breeding from Vancouver Island, 

 Queen Charlotte Islands, etc., British Columbia to Kodiak and Una- 

 laska islands, Alaska; southward in winter as far as San Diego Bay, 

 southern California. 



[Colymbus] mnrmoralus Gmelin, Syst. Nat., i, pt. ii, 1789, 5S3 (Prince William 



Sound, Alaska). 

 [Uria] marmorata Latham, Index Orn., ii, 1790, 799.- 



o Ten specimens. 



b Six specimens. 



Looalitv. 



Win::. 



Tail. 



Ex- 

 posed 



cul- 

 men. 



Jliddle 

 toe. 



MALES. 



Soven adult males Irum Alaska 



One adiilt male from Vancouver Island 

 Two adult males from Washington 



FEMALES. 



Four adult females fronj Alaska 



Two adull females from Washington. . . 



125. 

 129 

 126 



120.6 

 12?. 7 



30. 8 14. 6 



35 ! 16 

 31.5 i 16.2 



30.5 

 30.5 



15.4 

 15.5 



15.8 

 16.5 

 16.2 



15.5 

 15.7 



24.1 



25 



24.5 



23.5 

 23.7 



