BIRDS OF NORTH AND MIDDLE AMERICA. 



761 



Range.— Pacific coast of North America, from California to Aleutian 

 Islands. (Monotypic.) 



PTYCHORAMPHUS ALEUTICUS (Pallas). 



CASSIN'S ATTKLET. 



Adults (sexes alike). — Upper parts plain grayish dusky or dull 

 blackish slate, inclining to dull brownish slate on hindneck and post- 

 ocular region, the rump and upper tail-coverts more decidedly slaty, 

 the back and scapulars tinged with the same; an indistinct whitish 

 bar or elongated spot near each eyelid; malar and rictal regions, 

 chin, throat, and foreneck plain brownish gray (between quaker 

 drab and deep mouse gray), the outer portion of sides and flanks 

 pure gray (nearly neutral gray) ; under wing-coverts brownish gray, 

 some of the larger coverts grayish white; rest of under parts 

 immaculate white; bill black, the basal third of mandible pale 

 brownish (yellowish or flesh colored in life?); iris white; legs and feet 

 dusky brownish (bluish and dusky in life) . 



Young. — Similar in coloration to adults. 



Downy young. —Upper parts deep sooty grayish brown, the sides 

 and chest similar but paler; chin, throat, breast, and abdomen dull 

 grayish white. 



Adult male.— Wing, 109.5-129 (120.7); tail, 28-34.5 (31.4); exposed 

 cuhnen, 18.5-20 (19.3); tarsus, 23.5-25 (24.6); middle toe, 26.5-30 

 (28.7).« 



Adult female.— Wing, 120-122 (121); tail, 25-32.5 (29.3); exposed 

 cuhnen, 18.5-19 (18.8); tarsus, 24-25 (24.3); middle toe, 28-28.5 

 (28.2).'' 



Pacific-coast and islands of North America, from Aleutian Islands 

 (Atka; Attn; Agatu; Unalaska) to Lower California (San Geronimo 

 Island, breeding: Los Coronados Islands, breeding; Cerros Island 

 winter; Natividad Island, April 14; San Benito Island, April 26; 



