69 



KEY TO ALCIDS (Cont.) 



8 Leading edge of wing black or dark brown. 9 



8' Thin white line running along leading edge of wing from shoulder to 



wrist. 11 



9 Extensive white coloration on upper surface of wing. 10 



9' Upper wing surface entirely dark gray. 14 



10 Upper wing coverts extensively white except for a black bar running 



part way through them. PIGEON GUILLEMOT, adult 



10' Upper wing coverts mottled black and white. PIGEON GUILLEMOT, immature 



11 Belly dark. 12 

 IT Belly white. 13 



12 Face, including forehead, usually white; upper mandible usually with 

 2-3 vertical grooves (Plate 32-1); except during fall, long tufts of 

 white to yellowish feathers extending backward from above eyes. 



TUFTED PUFFIN, adult 



12' Face (except small area behind each eye) dark; upper mandible smooth 



(Plate 32-6). TUFTED PUFFIN, immature 



13 Breast dark; face same gray color as remainder of head and upper 

 surfaces (except that white plumes are often present). 14 



13' Breast and belly white; dark collar extending around throat; face 



white or very light gray; no plumes. 15 



14 White plumes projecting backward from behind eye and from cheek. 



RHINOCEROS AUKLET, adult 



14' White plumes on face absent. RHINOCEROS AUKLET, immature 



15 Face white. HORNED PUFFIN, adult 

 15' Face light gray. HORNED PUFFIN, immature 



