HYPOTHETICAL LIST. 1 



FAMILY PODICIPID^E. 

 1. JEchmophorus clarkii (LAWR.). 



Clark's Grebe. 



Podiceps clarkii LAWR. in BAIRD'S B. N. Am. 1858, 895. 

 jEchmophoms clarkii COUES, Pr. Ac. Nat. Sci. Phila. 1862, 229. 



[B 705, C 608 a, R 730, C 846.] 



Probably the female of ^E. ocridcntalis (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^B. 

 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 -.] 



North American, but its specific validity not satisfactorily estab- 

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



1 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. 



