HYPOTHETICAL LIST. 371 



Creagrus • furcatus (Neboux). Swallow-tailed Gull. 



Lams furcatus Neboux, Zool. Voy. Venus, Atlas, Livr. 2, 1842, pi. 10. 

 (Monterey, California.) 



The type locality of this tropical species is apparently incorrect. There is 

 no other evidence of its occurrence in North America. Originally entered as 



Xema (Creagrus) furcatus. 



Larus nelsoni Henshaw. Nelson's Gull. [46.] 



Lams nelsoni Henshaw, Auk, I, No. 3, July, 1884, 250. (St. Michael, 

 Alaska.) 



Now regarded as a hybrid between Larus hyperboreus Gunnerus and Larus 

 argentatus vegae Palmen (cf. Dwight, Bull. Amer. Mus. Nat. Hist., LII, 

 Art. 3, Dec. 31, 1925, 250) and transferred to the Hypothetical List. 



Larus kumlieni Brewster. Kumlien's Gull. [45.] 



Larus kumlieni Brewster, Bull. Nuttall Orn. Club, VIII, No. 4, Oct., 

 1883, 216. (Cumberland Sound, Arctic America.) 



Now regarded as a hybrid between Larus leucopterus Faber and Larus 

 argentatus thayeri Brooks (cf. Dwight, Bull. Amer. Mus. Nat. Hist., LII, 

 Art. 3, Dec. 31, 1925, 254), and transferred to the Hypothetical List. 



[Cepphus carbo Pallas. Sooty Guillemot. 



Cepphtis carbo Pallas, Zoogr. Rosso-Asiatica, 11, 1811, 350. (circa 

 insulas Aleuticas = Aleutian Islands.) 



Type locality regarded as probably erroneous as there is no other evidence 

 of the occurrence of the species on the American side of the north Pacific. 

 It was dropped from the List in the third edition.] 



Cepphus motzfeldi (Benicken). Black-winged Guillemot. 



Uria motzfeldi Beni ken, Isis von Oken, XV, 1824, Heft viii (Aug.), col. 

 889. (Greenland seas.) 



Now Ijelieved to be a melanistic phase of Cepphus grylle (Linn.a.eus). 



Starnoenas- cyanocephala (Linnaeus). Blue-headed Quail-Dove. [323.] 



Columba cyanocephala Linnaeus, Syst. Nat., ed. 10, I, 1758, 163. 

 (Jamaica = Cuba.) 



Audubon's record of this Cuban species on the Florida Keys is regarded 

 as unsatisfactory ; and as it has never been confirmed the species is now trans- 

 ferred to the Hypothetical List. 



1 Creagrus Bonaparte, Naumannia, 1854, 213. Type, by orig. desig., Larus 

 furcatus Neboux. 



^Starnoenas Bonaparte, Geog. and Comp. List, 1838, 41. Type, by 

 monotypy, Columba cyanocephala Linnaeus. 



