196 Dwight, A New Species of Loon. [April 



A NEW SPECIES OF LOON (GAVIA VIRIDIGULARIS) 

 FROM NORTHEASTERN SIBERIA. 



BY JONATHAN DWIGHT, M. D. 



There has been a good deal of confusion regarding the status 

 of the Black-throated Loon (Gavia arctica) and its allies. Two 

 instances may be cited. Hartert states that " According to Buturlin 

 both G. arctica and G. pacifica are found breeding side by side in 

 areas of thousands of miles. We cannot therefore treat them as 

 geographical forms of one species" (Hand-List of British Birds, 

 1912, p. 159), and Hersey in his recent review of this species says 

 that "three Alaskan specimens when compared with available 

 material from Siberia and northern Europe prove to be the Asiatic 

 form Gavia arctica suschkini Sarudny, and not Gavia arctica arctica 

 (Linnaeus)" (Auk, XXXIV, July 1917, p. 289). Mr. Hersey 

 informs me that his birds have green throats, but as a matter of 

 fact, suschkini is a purple-throated bird and undoubtedly a race of 

 arcticus as claimed by the describer, N. A. Sarudny. For the 

 benefit of those who do not read Russian, wherein much of the 

 present tangle lies, I have obtained a translation of the original 

 description kindly made by my friend Mr. Roman de Majewski. 

 It appeared in a Moscow journal which bears a title in three lan- 

 guages, Russian, French and German, and the citation therefore 

 is [Russian], = Messager ornithologique, = Ornithologische Mitthei- 

 lungen, 3rd year, 1912, No. 2, pp. 111-113, being a continuation 

 of N. A. Sarudny's "[Russian title =] Mittheilungen fiber die Orni- 

 thologie von Turkestan." 



142. Urinator arcticus suschkini subsp. nov. 



The Striped Diver is to be found in Russian Turkestan during migration, 

 and in winter-time. To judge by the specimens I have collected, they show 

 such divergence from the types of the Pskovskoi and St. Petersburg pro- 

 vinces that in my opinion they should not be given the name Urinator 

 arcticus (Linn.) but placed in a separate category. 



