AVES FALCONID^. 555 



This form of the Turkey Buzzard was not found by the naturalists sent 

 by Princeton to Patagonia ; the descriptions are based on two birds, a pair 

 from the Museo de La Plata in exchange. Both birds were taken in Chili 

 in March, 1898, and appear to be typical birds of the kind known as C. 

 falklandicus. The gloss on the birds is certainly different in color and 

 more pronounced than in C. aura ; otherwise the birds are much alike, 

 save for the ashy white on the median coverts and secondaries, which is 

 accentuated more particularly in the female bird. 



Order ACCIPITRIFORMES. 



Sharpe, Classif Bds. p. 78 (1891); Sharpe, Hand-list Bds. i. p. 241 

 (1899). 



Family Falconid^e. 



Sharpe, Cat. Bds. Brit. Mus. i. p. 30 (1874); Sharpe, Hand-list Bds. i. p. 

 243(1899). 



Subfamily Polyborin^. 

 Sharpe, Cat. Bds. Brit. Mus. i. p. 30 (1874) ; Sharpe, Hand-list Bds. i. p. 



243 (1899)- 



Genus POLYBORUS Vieill. 



Type. 



Polyborns, Vieill. Analyse, p. 22 (1816); Sharpe, Cat. Bds. 

 Brit. Mus. i. p. 31 (1874); Sharpe, Hand-list Bds. i. p. 



243 ( 1 899) P. piancus. 



Caracara, Less. Traite, p. 34 (183 1) P. planats. 



Geographical Range. — South America, south to Cape Horn, Central 

 America and Mexico, reaching into the southern border of the United 

 States. 



PoLYBORUS PLANCUS (Miller). 



Le Busard du Brdsil, Briss. Orn. I. p. 405 (1760); Plaintive Eagle, Lath. 



Gen. Syn. I. p. 34 (1781 : Tierra del Fuego). 

 Brazilian Kite, Lath. t. c. p. 63 (ex Briss.) 



Falco piancHS, Miller, Var. Subj. Nat. Hist. pi. 17 (1778 : Tierra del Fuego.) 

 Falco tharus, Molina, Saggio St. Nat. Chil. p. 234 (1782); Gm. Syst. Nat. 



Lp. 254(1788). 

 Falco piancus, Gm. Syst. Nat. I. p. 257 (1788: ex Lath. p. 34). 



