BY POIRETICAL LSE.’ 
FamMiLty PODICIPID Ai. 
1. Aichmophorus clarkii (Lawr.). 
Clark’s Grebe. 
Podiceps clarkii LAwR. in Barrv’s B. N. Am. 1858, 895. 
Aachmophorus clarkit Cours, Pr. Ac. Nat. Sci. Phila. 1862, 229. 
[B 705, C 608a, R 730, C 846. ] 
Probably the female of 2. 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.) 
Famity ALCIDZ. 
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. 
(Bee Sy Res ou 
North American, but its specific validity not satisfactorily estab- 
lished. (C/ Steyn. 7. c., and Water B. N. Am. IT. 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 
absence of satisfactory proof of their validity as species. 
