71 



KEY TO ALCIDS (Cont.) 



23' Tail and flight feathers present (as in Fig. 26); length of middle 



toe <26 mm. CRAVERI'S MURRELET 



24 Wing length <90 mm; primaries absent or tiny (Fig. 25). 



THICK-BILLED OR COMMON MURRE, juvenile 



24' Wing >95 mm; primaries present. 25 



25 Wing length 97-105 mm. 26 

 25' Wing >1 15 mm. 27 



26 Bill red with white tip; long curved feathers form crest on fore- 

 head; white facial plumes very prominent. WHISKERED AUKLET, adult 



26' Bill yellowish at base, dark at tip; no crest; white facial plumes 



present but not prominent. WHISKERED AUKLET, immature 



27 Secondaries and tail feathers broadly (2-3 mm wide) tipped with 



white. 28 



27' Wing and tail feathers dark except some coverts on upper surface of 



wing may be very narrowly edged with white. 29 



28 Belly and breast white except many feathers tipped with dark brown, 

 giving undersurfaces a speckled appearance; remainder of head and 

 body plumage brown, streaked with white and buffy. 



KITTLITZ'S MURRELET, breeding plumage 



28' Sides of head and all undersurfaces completely white except for a 

 dark incomplete breast collar (Fig. 12b) and a very occasional 

 feather with a dark tip; scapular and shoulder feathers white. 



KITTLITZ'S MURRELET, winter or immature 



29 Scapulars cinnamon OR white. 30 

 29' Scapulars gray, same color as remainder of wing. 31 



30 Scapulars cinnamon; undersurfaces of body with white feathers 

 tipped with brown giving spotted appearance; upper surfaces dark. 



MARBLED MURRELET, breeding plumage 



