274) On Anser erytliropus and its Allies. 
of A. gambeli having the culmen 2'35 in._, and gradually 
diminish to those of an example of A erythrupus having 
the culmen barely 1'2 in., a very great difference indeed; 
my measurements are taken from the tip of the beak to the 
commencement of the frontal feathers : — 
Ciilmen. Tarsus, 
iu. in. 
A. gambeli. ' N. Amer. Birds,' by Baird, Brewer, 
& Ridgway, i. p. 449 \ 2-35 3-10 
A. gambeli. Cat. of Birds in B. M. xxvii. p. 97. . 2*3 
A. alhifrons. Leadenhall Market, January. Im- 
mature 2-1 2-8 
A. gambeli?, 5' California, February 1855, in 
Cambridge Museum 1"9 2-8 
A. albifrons, $ . Islay, N.B., January 2*0 2-6 
A. albifrom, $ . Co. Mayo (F. Coburn) 1-8 - 2-4 
A. albifrmis, $ . Egypt, karcb 1-7 2-3 
Mr. Coburn's example, 5 {A. ei-ythropus ?), from 
the Wash, shot in January 1'5 2*4 
A. erythropus, S • Northumberland, September. 
Immature 1"4 2*2 
A. erythropus, 5 • Siberia, June. (Dresser, B. 
of E. vi. p. 388.) 1-3 .2-2 
A. erythropus. Delta of the Nile, January, 1875. 
immature 1-2 2*2 
A. erythropus was first introduced as a British bird at 
a meeting of the Zoological Society of London held in. 
November 1886^ when a young male, shot by Mr. A. C. 
Chapman on the coast of Northumberland^ was placed upon 
the table ; of this Mr. Chapman has given a full account in 
^The Field ^ of Dec. 11th, 1886 (vol. Ixviii. p. 87), where he 
states that it weighed only .2^ lbs., which is 2 lbs. less than 
Mr. Coburn^s bird. Indeed, so small is A. erythropus that it 
has been compared to an Eider Duck and even to a Mallard : 
one shot on the Yenisei by Mr. Popham weighed 4^ lbs. The 
weight of A. albifrons is given in Mr. Harting^'s ' Handbook 
Brit. B.' ed. 2, at Q^-7 lbs., but that is much more than the 
weight of two Norfolk examples weighed by me, which were 
5 lbs. and 4| lbs. respectively. Another specimen of A. ery- 
thropus^ the head of which I saw, was shot in January 1888 
in Somersetshire, but it was supposed to have escaped from 
