NATATORES. ALCAD^E. 417 



Fore part of the neck having a large patch of deep 

 orange-brown. Lower part of the neck, and sides of 

 the breast, white, with the central parts of the feathers 

 blackish-grey. 



Under plumage silvery white, except the flanks, which are 

 deep clove- brown. Upper plumage deep clove-brown, 

 with a slight glossy green reflection. Irides red. Out- 

 side of the legs greenish-grey ; inside livid, or purplish- 

 white, tinged with blue. Membrane of the toes the 

 same. 



PLATE 78. represents a Young Bird, of the natural size. Young 

 Forehead, crown, nape, and back part of the neck deep 

 grey, finely streaked with greyish- white. Chin, throat, 

 and under plumage, white. Flanks with large arrow- 

 shaped dark grey spots. Upper plumage blackish-grey, 

 inclining to clove-brown ; the margins of the feathers 

 being deeply bordered near their tips with white and 

 smoke-grey. Quills deep clove-brown. Bill ash-grey, 

 tinged with flesh-red. Outsides of the legs dark green- 

 ish-grey ; inside surface and webs greenish- white. Irides 

 reddish-brown. 



After the second moult, the grey upon the head, cheeks, 

 See. acquires the tint of the adult ; and a few red fea- 

 thers are often found mixed with the white upon the 

 fore part of the neck. The upper parts assume a deeper 

 tint ; the spots of white grow less, frequently changing 

 to a yellowish-white ; and as the bird advances to ma- 

 turity entirely disappear. 



FAMILY III. ALCAftffi. 



APPROACHING closely in form, and possessing natatorial 

 powers fully equal to the Cohjmbidce, the present family, 

 voi i. D d 



