SYNTHLIBORAMPHUS. 13 
b'. Wing 5.00 or more; adult in breeding season with several conspicuous de- 
ciduous plates on basal portion of bill, including a roundish or semicir- 
cular piece at corner of mouth ; no white feathers between bill and eye; 
belly never whitish. (Subgenus Simorhynchus.) Breeding plumage: 
Bill bright orange-red, the tip horn-colored. Winter plumage: Bill horn- 
colored, much smaller, through loss of the deciduous pieces. Young: 
Frontal crest and white feathers beneath eye wanting, or but slightly 
developed; bill much smaller, dusky brownish. Length 8.50-10.80; 
wing about 5.25. Egg 2.14-149. Hab. Coasts of the North Pacific 
from Kadiak, Unalashka, and the Prybilof Islands through the Aleutian 
chain to Kamtschatka and northern Japan. 
18. S. cristatellus (Patt.). Crested Auklet. 
6. Wing less than 4.50; adult in breeding season without conspicuous deciduous 
plates on basal portion; belly whitish; a more or less distinct patch of 
narrow, pointed, white feathers between bill and eye (indistinct or ob- 
solete in young). (Subgenus Phaleris Temmincx.) Breeding plumage: 
Bill dull purplish red, the tip whitish. Winter plumage not materially 
different. Young: Frontal crest and white feathers on sides of head 
wanting or barely indicated; bill dusky. Downy young: Uniform sooty 
slate, lighter beneath. Length 7.10-8.30, wing 4.10-4.25, culmen .35-.40. 
Hab. Coasts of the North Pacific, from Unalashka through the Aleutian 
chain to Kamischatka... 19.S. pygmzeus (Gmet.). Whiskered Auklet. 
a’. Wing not more than 4.00; adult without frontal crest ; lower parts white, some- 
times blotched with dusky; scapulars with more or less white; base of bill 
with a small compressed knob on top. (Subgenus Ciceronia Retcu.) Breed- 
ing plumage: Lower parts white, more or less spotted or blotched with 
dusky, this often forming a distinct band across the chest. Winter plumage : 
Lower parts, including sides of neck, entirely white; white ornamental 
feathers of forehead, etc., usually less developed. Young: Similar to winter 
plumage, but bill smaller, scapulars more extensively white, and white orna- 
mental feathers of forehead, etc., wanting. Downy young: Uniform sooty 
slate, paler and grayer on lower parts. Length 5.50-7.20, wing 3.50-4.00, 
culmen .35-.40. Eggs 158 1.10. Hab. Coasts of the North Pacific, from 
Japan and southern Alaska to the Aleutian and Prybilof Islands. 
20. S. pusillus (PAtt.). Least Auklet. 
Gzunus SYNTHLIBORAMPHUS Branpr. (Page 9, pl. VI., fig. 1.) 
Species. 
Common Cuaracters.—Above plumbeous, beneath white. Breeding plumage : 
Chin and part, or whole, of throat dusky ; top of head with a broad white stripe 
along each side ; sides, from neck to flanks, uniform sooty blackish. Winter plumage : 
Whole throat white, the chin plumbeous; no white stripes on top of head; sides 
and flanks white, striped with slaty. 
