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418 Mr. H. E. Dresser’s Notes on 
All the above species are certainly descended from four 
different parent forms, and have spread into the localities in- 
habited by the four following species, viz. Anser skornia- 
kovi (A. indicus), Bernicla picta, Bernicla ruficollis, and Ber- 
nicla torquata, which do not subdivide ito different forms ; 
but the former groups are still undergoing the struggle for 
existence, the balance being on the side of A. segetum and A. 
albifrons. I also observed that when on migration in the 
Ural, A. albifrons and A. minutus existed together very well, 
but A. medius, the intermediate form between these two 
Species, was not so numerous. All these facts are proofs in 
favour of the Darwinian theory, of which the Geese give many 
interesting illustrations.” 
359. ANSER SEGETUM (Gm.); Severtzoff, p. 70. 
Horizontal range. Occurs on passage in districts I., I., and 
III., and winters in the last. 
Vertical range. Occurs on passage in districts 1 and 2, and 
winters in district 2. 
360. ANSER oBscuRUS, Brehm; Severtzoff, p. 70. 
Horizontal range. Is rare in winter in district III. 
Vertical range. Occurs in winter in district 2. 
361. ANSER CINEREUS, Meyer; Severtzoff, p. 70. 
Horizontal range. Breeds in all four districts, and winters 
in district ITI. 
Vertical range. Breeds in districts 1, 2, 8, and 4, and win- 
ters in district 2. 
362. ANSER ALBIFRONS, Bechst.; Severtzoff, p. 70. 
Horizontal range. Occurs rarely on passage and in winter in 
district ITI. 
Vertical range. Occurs on passage in district 1, and rarely 
in winter in district 2. 
363. ANsER cyenorpEs (L.); Severtzoff, p. 70. 
Horizontal range. Possibly breeds in district I. 
Vertical range. Possibly breeds in district 2. . 
364, BernicLa RUFICOLLIS (Pall.). 
Anser ruficollis, Severtzoff, p. 70. 

