^°1908^^] BuTURLiN, Red-spotted Bluethroat of Alaska. 35 



Prof. Macoun listed the eastern Robin in this region, but all of our birds 

 were propinqua. 



Erratum. 



In 'The Auk,' Vol. XXIV, plate xviii, fig. 1, for "Nests of Western 

 Grebe," read " Nests of California Grebe." 



RED-SPOTTED BLUETHROAT OF ALASKA. 



BY S. BUTURLIN. 



In Part IV, p. 15, of the monumental work of Dr. R. Ridgway, 

 'The Birds of North and jNIiddle America,' the Alaskan specimens 

 of the Red-spotted Bluethroat are mentioned under the name 

 "Cyanosylvia suecica (Linnaeus)." 



Though having seen no specimens procured in Alaska I do not 

 hesitate to state, that Alaskan specimens do not belong to the 

 typical form, Cyanecula (or Cyanosylvia) suecica suecica (L.), 

 so common in summer in Scandinavia and northern Europe gen- 

 erally, but are in fact identical with the East Siberian form, named 

 by me^ C. suecica robusta (in Russian in 'Psovaia i Rusheinaia 

 Okhota,' i. e., 'Hunting and Shooting,' 1907, No. 6, published 

 13 March, p. 87; in German in 'Ornith. Monatsb.,' Maiheft, 

 1907, p. 79). 



First of all, the dimensions given by Dr. Ridgway for Alaskan 

 specimens (/. c, p. 16) are too large for C. suecica (L.) typ. but 

 quite agree with those of C. suecica robusta, as will be seen from 

 dimensions given below for different forms of this species. Sec- 

 ondly, it must be kept in mind, that Bluethroats are not met with 

 migrating or wintering anywhere in America south of Alaska; 

 therefore it is to be presumed, that birds summering in Alaska 

 migrate in autumn westward to the mainland of Asia, and pass the 

 winter there; but all Bluethroats of Eastern Asia belong to the 

 form robusta. 



1 Evidently ajter the fourth part of the great work above mentioned was in 

 print.— S. B. 



