AVES FALCONID^. 



571 



the 24th of April. Burmeister's records from Rio Chico [de Santa Cruz?], 

 Patagonia, would be close to where Mr. Colburn collected his single bird. 

 This has generally been considered as a bird of the higher altitudes of the 

 Cordillera in Peru and Chili; the extension of its known range to the 

 southeastern coast of Patagonia is therefore of notable interest. There 

 are no adults among the birds procured by the Princeton Expeditions. 



Ibycter albogularis (Gould). 

 Polyborus [Phalcobmius] albogjtlaris, Gould, P. Z. S. 1837, P- 9 (Santa 

 Cruz, Patagonia). 



~ "is. 



Ibycter albogularis. Adult male. P. U. O. C. 8304. About one-sixth natural size. 



Milvago albogularis, Darw. Voy. Beagle, Birds, pp. 13, 18, pi. I. (1841: 

 Santa Cruz, April); Scl. Ibis, 1861, p. 23 (Patagonia); id. & Salv. 

 Nomencl. Av. Neotr. p. 122 (1873); Burm. An. Mus. Nac. Buenos 

 Aires, III. part X. p. 241 (1888), part XI. p. 315 (1880: Santa Cruz). 



Ibycter albigularis, Sharpe, Cat. B. Brit. Mus. I. p. 37 (1874); Oust. Miss. 

 Scient. Cap Horn. Oiseaux, pp. 250, 324 (1891 : Rio Gallegos, June); 

 Sharpe, Hand-list B. I. p. 244 (1899); Martens, Hamb. Magalh. 

 Sammelr. p. 5 (1900: Patagonia). 



