BIRDS OF NORTH AND MIDDLE AMERICA. 775 
* 
originating immediately beneath eye and extending downward and 
backward along upper edge of auricular region. Upper parts dull 
slate-blackish, under parts plain brownish gray. 
Range.—Kodiak Island, Aleutian Islands, and islands of Bering 
Sea to northern Japan. (Monotypic.) 
ETHIA CRISTATELLA (Pallas). 
CRESTED AUKLET. 
Adults in-breeding season.—Upper parts, including recurved frontal 
crest, plain slate-blackish; forhead and entire under parts plain 
brownish gray, paler on posterior under parts; narrowly acicular 
auricular plumes white; bill, including supra-rictal plate, orange-red 
or reddish orange, the tip more or less whitish or pale horn color; iris 
white; legs and feet pale violet-gray (in life), the joints darker, webs 
blackish, and soles black. 
Winter plumage.—Similar in coloration to the breeding plumage, 
but bill smaller (through shedding of supra-nasal cuirass, supra- 
rictal plate, and other parts, and dull brownish or horn color instead 
of reddish orange. 
Young.—Similar to winter adults, but crest and auricular plumes 
absent or but slightly developed, and bill still smaller. 
Downy young.—Uniform sooty grayish brown, slightly paler below. 
Adult male.—Wing, 125-143 (134.8); tail, 33-38 (35.7); exposed 
culmen, 10-12 (11.2); greatest depth of bill, 10-12 (11.1); tarsus, 
24-28 (26.4); middle toe, 29.5-35.5 (83.1).¢ ; 
Adult female.—Wing, 131-137 (134); tail, 31-39 (34.5); exposed 
culmen, 10.5-11.5 (10.9); greatest depth of bill, 9.5-12 (10.5); tarsus, 
25-27 (25.8); middle toe, 30-34 (382.2).° 
Coasts and islands of Bering Sea and immediately contiguous por- 
tions of Arctic and northern Pacific Oceans, from Wrangel, Herald, 
and Diomede Islands and eastern coast of Siberia (Emma Harbor; 
Plover Bay), etc., to Kodiak Island and northern Japan; breed- 
a Ten specimens. b Seven specimens. 
Ex. | Great . 
Locality. Wing. | Tail. | posed decin Tarsus. ania 
culmen,) of bill. 
MALES. 
Nine adult males from Alaska............+---------0-- 135.1 35.6 11.2 10.9 26.3 33 
One adult male from Bering Island, Kamchatka... ... 133 36.5 12 13 27 34 
FEMALES. 
Five adult females from Alaska.........-.....-.2--+5- 133.8 33.9 10.9 10.2 25.9 32.7 
One adult female from eastern Siberia (Emma Harbor).| 136 39 ll 10.5 25 32 
One adult female from Bering Island..........-..----- 133 33 ll 12 26 30 
