316 B. 0. U. List of British Birds. [Ibis, 



George Grray was the first author who recognized 

 the necessity o£ fixing a type-species to each genus, 

 and in the first two lists published in 1840 and 1841, 

 working with the 12th edition of Linnseus, he fixed 

 the type of Colymhis as C. glaciaUs. Later in 1855 

 (Cat. Gen. Subgen. Bds. \). 125). finding that 

 C. glar'mlis did not occur in the earlier editions of 

 Linnseus, he substituted ardicus, which name is 

 found in all the early editions of Linnseus's Syst. 

 Nat. from 1735 to 1758; but as he had already in 

 his previous lists suggested glaciaUs for Colymlnis of 

 the 12th edition, he wrote : " Linn. 1735 nee 1766." 

 Gray's intention was perfectly obvious and reasonable, 

 and we fear, if his action in this case is rejected (as 

 it is in the Supplement just published in the 'Auk,* 

 1920, p. 445), it will open a loopihole for upsetting 

 a large number of other ty])e-designations by the 

 same author. 



The A. 0. U. Check-list Committee have now 

 abandoned the ground they took up in the earlier 

 editions of the Check-list, and merely quote "type by 

 subsequent designation of the A.O. U. Check-list 

 Committee," although that action has been shown 

 (B. 0. U. List Brit. Birds, p. 399) to be based on a 

 fallacy. 



Podiceps is confirmed for the Grebes. 

 Page 

 133. KyctaJa funerea v. teiufmalmi {vide B. 0. U. List, 



p. 378 ; also Auk, 1919, p. 447). 

 N. funerea accepted and confirmed. 



145. Milvns migrans v. M. I'orschun. 



M. migrans accepted and confirmed. 



150. Falco (vsalon v. F. reguhis. 

 F. cesalon accepted. 



159. Anser erytliropus v. A. fnmarcMcJms. 



A. erytliropus accepted {vide Lonnberg, Ibis, 1913, 

 p. 400, and Hartert, V. p. F. p. 1282). 



