316 
B. 0 . U. List of British Birds. [Ibis, 
George Gray was the first author who recognized 
the necessity of fixing a type-species to each genus, 
and in the first two lists published in 1840 and 1841, 
working with the 12th edition of Linnaeus, he fixed 
the type of Colymbus as C. glacialis. Later in 1855 
(Cat. Gen. Subgen. Bds. p. 125), finding that 
C. glacialis did not occur in the earlier editions of 
Linnaeus, he substituted arcticus , which name is 
found in all the early editions of Linnaeus’s Syst. 
Nat. from 1735 to 1758; but as he had already in 
his previous lists suggested glacialis for Colymbus of 
the 12th edition, he wrote : “Linn. 1735 nec 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 loophole for upsetting 
a large number of other type-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. 0. U. Check-list 
Committee/’ although that action has been shown 
(B. 0. U. List Brit. Birds, p. 399) to be based on a 
Podiceps is confirmed for the Grebes. 
Page 
133. Nyctala funerea v. tengmalmi (vide B.O.U. List, 
p. 378 ; also Auk, 1919, p. 447). 
A r . funerea accepted and confirmed. 
145. Milvus migvans v. M. korschun. 
M . migrans accepted and confirmed. 
150. Falco cesalon v. F. regulus. 
F. cesalon accepted. 
159. Anser erytliropus v. A. finmarchichus. 
A. erytliropus accepted ( vide Lonnberg, Ibis, 1913, 
p. 400, and Hartert, V. p. F. p. 1282). 
