AVES ANATID^. 



437 



Apparently, magellanica has not been obtained in western South America 

 or on the sea coasts of that country ; nor has iuoruata been recorded from the 

 Falkland Islands. While the two forms probably intergraded in com- 

 paratively recent times, it does not seem that they do at present even 

 on the grounds of variability shown, and the distribution of the two 

 kinds of geese under discussion is chiefly interesting as a record of their 

 present range, which in the future may very probably crystallize into each 

 species occupying a definite region to the exclusion of the other, a condi- 

 tion already prevailing on the outer boundaries of the present range of both. 



Chloephaga rubidiceps Sclater. 



Chloephaga poliocephala (part). Gray, List B. Brit. Mus. Part III. p 217 



(1844). 

 Bernicla uiornata, Gray (nee King), Voy. Ereb. & Terror, Birds, pi 24 



(1846). 

 Chloephaga rubidiceps, Scl. P. Z. S. i860, pp. 387, 415, pi. CLXXIII 



(Falkland Isl), 1861, p. 46; Abbott, Ibis, 1861, p. 158 (Falkland 



Isl.) ; Scl. Ibis, 1864, p. 123 ; id. P. Z. S. 1869, p. 629; Gray, Handl. 



B. III. p. 77, no. 10590 (1871) ; Scl. & Salv. Nomencl. Av. Neotr. 



p. 128; Sharpe, Voy. Ereb. & Terr. Birds, p. 37 (1875) ; Salvad. Cat. 



B. Brit. Mus. XXVII, p. 136 (1895); Sharpe, Hand-list, B. I. p. 



214 (1899) ; Martens, Hamb. Magalh. Sammelr. Vog. p. 24 (1900: 



Falkland Islands). 

 Anser rubidiceps, Schl. Mus. Pays Bas, VI. Anseres, p. 102 (1866). 

 Chloetrophiis rubidiceps, Bann. Proc. Acad. Philad. 1870, p. 131. 

 Bernicla rubidiceps, Scl. & Salv. P. Z. S. 1876, p. 367 ; Scl. P. Z. S. 



1880, p. 503 ; Burm. An. Mus. Nac. Buenos Aires, III. Part X. p. 



247 (1888: Falkland Isl.) ; Scl. P. Z. S. 1892, p. 472. 

 Anser [Brenthus] rubidiceps, Reichen. Orn. Centralbl. 1882, p. 36. 

 Bernicla {Chloephaga) rubidiceps. Oust. Miss. Sci. Cap Horn, Oiseaux, p. 



312 (1891). 



General description. 



Size. — Total length, 23 inches. 



Wing, 13.5. 



Culmen, 1.5. 



Tail, 4.5. 



