72 



KEY TO ALCIDS (Cont.) 



30' Scapulars white; undersurfaces of body largely white except for 

 occasional dark tipped feathers; lower face white. 



MARBLED MURRELET, winter and immature 



31 Bird entirely gray except often some elongated white feathers on 



face. 32 



31' White on belly and breast; remainder of plumage gray except often 



some elongated white feathers on face. 33 



32 No elongated, curved feathers on forehead forming a crest; no 



white plumes on face. CRESTED AUKLET, immature 



32' Elongated feathers forming a crest on forehead; white plumes ex- 

 tending backward from face. CRESTED AUKLET, adult 



33 Throat dark; bill red; elongated white plumes extending backward 



from behind eye. PARAKEET AUKLET, breeding plumage 



33' Throat light; bill dark; no elongated white plumes on face. 



PARAKEET AUKLET, winter adult and immature 



