AVES FALCONID^. 



615 



in northern Argentina there seems to be no question, but our knowledge 

 of its life history is at present meager. 



W. B. Barrows says of its occurrence in Uruguay (Auk, 1884, pp. 109- 

 iio): "Not unfrequently seen at Concepcion in cold weather, and a 

 single one was seen as late as September 29. 



Fig. 306. 







Heterospizias ineridionalis . Immature male. One-third natural size. 



"About July 21, 1880, during an almost unprecedented rise of the 

 river, many rather scarce Hawks became quite abundant for a few days, 

 and among them was the present species. A female, taken July 21, ap- 

 peared so gorged with food that it was easily shot, but an examination 



