MARBLED GUILLEMOT. 525 



ble slightly drooping, not notched ; that of the lower mandible 

 excavated or sloping. The nostrils are short, narrow, basal slits 

 near the commissure. No hind toe. 



Winter plumage, with the head, neck, whole under plumage, scap- 

 ulars, rump, mirror of the wings, and tips of the dorsal feathers 

 white. A crescent shaped patch before the eye, the border of the 

 wing, the primary coverts, all the quills, the tail, and tips of the 

 scapulars, black. — In the spring and beginning of summer the 

 plumage is variously mottled, the summer dress being complete at 

 different periods in different individuals, but rarely before the be- 

 ginning of July. 



In the young of the year, the throat, breast and all the lower parts 

 are pure white. Summit of the head, nape, lower part of the neck 

 and sides of the breast blackish, spotted with grey and white. Back 

 and rump dull black. Some feathers of the scapulars and of the 

 rump tipped with whitish-ash. Wings black, except the mirror 

 which is white, but marked with blackish and cinereous spots. Inte- 

 rior of the mouth and feet livid reddish. Iris blackish-brown. 



MARBLED GUILLEMOT. 



(Uria marmorata, Lath. Synops. vi, p. 336. pi. 96. Bonap. Synops. 

 No. 372. Marbled Guillemot, Penn. Arct. Zool. 4to. ii. p. 230. 

 pi. 22. No. 438. Young of Uria grylle, Vieill.) 



Sp. Charact. — Brown, undulated with ferruginous ; beneath dusky, 

 spotted and barred with white ) feet yellow ; bill black, one inch 

 long. 



This species, yet but very imperfectly known, was brought 

 from Prince William's Sound, on the western coast of Ame- 

 rica. Another specimen was also obtained on the coast of 

 Karatschatka ; this individual formed part of the collection 

 of the late Sir Joseph Banks. Of their habits we are wholly 

 ignorant. 



The length of this species appears to vary from 9 to 10 inches. 

 The bill is compressed a little on the sides, and rather slender. 

 Crown of the head dusky. Upper part of the body transversely 



