HYPOTHETICAL LIST/ 



Family PODICIPID-ffl. 

 1. iEjChmophoms clarkii (Lawr.). 



Clark's Grebe. 



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

 jEchmophorus ciarkii QovsES, Pr. Ac Nat. Sci. Phila. 1862, 229. 



[B 705, C 6o3«, R 730, C 846.] 



Probably the female of yE. occidentalis (Lawr.). (QC Henshaw, 

 Bull. Nutt. Orn. Club, VI. 188 1, pp. 214-218 ; B. B. & R., Water B. N. 

 Am. II. p. 423 ; and especially Bryant, Auk, II. 1885, pp. 313, 314.) 



Family ALCID-ffi. 

 2. Cepphus motzfeldi (Benick.). 



Black-wiuged 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 — .] 



North American, but its specific validity not satisfactorily estab- 

 lished. (QC 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 lack of positive evidence of 

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

 sence of satisfactory proof of their validity as species. 



