634 GEOLOGICAL SURVEY OF NEW JERSEY. 



ish, with white spots ; lower parts white. Length; 27 inches or 

 less; wings, 11 inches; bill', 2 inches. 



" Young specimens of this rare bird have been occasionally 

 taken, not only on the coast, but in Delaware Bay. Met with 

 only during the depths of winter. Have seen but one adult 

 specimen killed in the State." — [C. C. A.J 



Family ALCID^. 



Auks. 



PRATBROULA, Briss. 



F. aijBtica, L. Arctic PuflSn. 



No hind toe ; deciduous basal shields on bill not white ; horny 

 processes on eyelids short ; upper parts and neck band blackish ; 

 sides of head gray ; whole throat grayish in breeding season ; 

 lower parts white. Length, 11 to 13 inches; bill. If inches. 

 Breed south as far as Bay of Fundy. 



" Occurs off the coast in winter, and is seldom met with; 

 This bird, like the razor-bill, remains wholly at sea, never being 

 met within the outer beach." 



CBPPHUS, Pal. 



O. mandtii, Licht. Mandt's Guillemot. 



Greater wing coverts all white ; rest of plumage black ; in 

 winter all except wings white, with black markings above. 

 Length, 13 inches; wings, 7 inches; bill, 1 inch. An arctic 

 form, breeding as far south as Labrador. Comes south as far 

 as New Jersey in winter. 



0. grylle, L. Black Guillemot. 



Much like above, except that basal half of white wing coverts 

 is black and bill is stouter. Breeds south to Maine. 



" Much more frequently met with than the arotioa and tarda, 

 and flies nearer the beach, but very seldom over it to the bay. 

 Noticed only during winter." 



