HYPOTHETICAL LISTJ 



Family ALCIDA. 



OSpphus motzfeldi (Benicken). Black-winged Guillemot. [2.] 

 Uria motzfeldi Benicken, Isis, XV, 1824, 889. (Greenland Seas.) 



North American, but its specific validity not satisfactorily estab- 

 lished. (Cf. Stejneger, Proc. U. S. Nat. Mus., VII, 1884, 210; 

 Water Birds N. A., II, 1884, 497, 498). 



Family LARID.S. 

 Genus CREAGRUS Bonaparte. 



Creagrus Bonapabtb, Naumannia, 1854, 213. Type, by orig. desig., 

 Lotus furcatus Nebotjx. 



Creams furclltas (Nebodx). Swallow-tailed Gull. [4.] 



Larus furcatus Neboux, Zool. Voy. "Venus, Atlas, 1842, pi. 10. ("Mon- 

 terey," California.) 



In all probability erroneously accredited to North America. 



» Consisting of species wliicli liave been recorded as North American, but whose status 

 as North American birds is doubtful, either from lack of positive evidence of their occur- 

 rence within the prescribed limits of the present Check-List, or from absence of satis- 

 factory proof of their validity as species. 



