HYPOTHETICAL LIST/ 



Family FODICIPIDiC. 



1. ^chmophorus clarkii (Lawr.). 



Clark's Grebe. 



Podiceps clarkii Lawr. in Baird's B. N. Am. 1858, 895. 

 ^chmophorus clarkii Coves, Pr. Ac. Nat. Sci. Phila. 1862, 229. 



[B 70s, C 608a, R 730, C 846.J 



Probably the female of ^. occidentalis (Lawr.). {Cf. Henshaw, 

 Bull. Nutt. Orn. Club, VI. 1881, pp. 214-218; B. B. & R., Water 

 B. N. Am. II. p. 423 ; and especially Bryant, Auk, II. 1885, 

 PP- 313, 314-) 



Family ALCID.2i. 



2. Cepphus motzfeldi (Benick.). 



Black-winged Guillemot. 



Uria motzfeldi Benick. Isis, Aug. 1824, 889. 

 Cepphus motzfeldi Stejn. Pr. U. S. Nat. Mus. VII. Aug. 5, 1884, 

 210. 



[B— , C- R— C-.J 



North American, but its specific validity not satisfactorily estab- 

 lished. {Cf. Stejn. /. c, and Water B. N. Am. II. 1884, pp. 497, 498.) 



' Consisting of species which have been recorded as North American, but whose 

 status as North American birds is doubtful, either from laclc of positive evidence 

 of their occurrence within the prescribed limits of the present Check- List, or from 

 absence of satisfactory proof of their validity as species. 



