1 1 . rOLTBOEUS. 31 



11. POLYBORUS. „ 



Tvpe. 



Polyborus, Vieill. Analyse, p. 22 (1816) P. tharus. 



Caracara, Less. Traite, p. 34 (1831) P. tharus. 



Bill of Poli/borus tharus. 



Range. The whole of Southern and Central America, extending 

 into the southern provinces of North America. 



Key to the Species. 



a. Lower back and rump brown, barred with white .... tharm, p. 31. 



b. Lower back and rump uniform dark brown cheritmy, p. 33. 



1. Polyborus tharus *. 



Le Busard du BresU, Briss. Orn. i. p. 40-5 (1700). 



Falco tharus, Molina, Snrjc/io St. Nat. C7u7. p. 264(1782). 



Falco plancus, Gm. S. N. i. p. 2.57 (1788). 



Falco bvasiliensis, Gm. S. X. i. p. 262 (1788) ; Ma.v. Beitr. iii. p. 190 



(1830). 

 Vultur cheriway, Lath. Incl. Orn. i. p. 8 (1790). 

 Vultur plancus, Lath. Ind. Orn. i. p. 8 (1790). 

 Falco cheriwav, Licht. Verz. Doubl. p. 00 (1823). 

 Polyborus brasilieusis, Vig. Zool. Journ. i. p. 320 (1824) ; Siuains. Zool. 



Illustr. ser. 2, pi. 2 (1832) ; Bp. Consp. i. p^ 13 (1850) ; Peh. Verh. 



s.-b. Wien, 1862, p. 137 ; Schl. Mas. P.-B. Polybori, p. 2 (1862, pt.) ; 



Belz. Orn. Bras. ^.m?j{l8:\). 

 Polyborus vulgaris, Sjn.r, Av. Bras. i. p. 3, pi. 1 (1824) ; Vieill Gal. 



Ois. i. p. 23, pi. 7 (1825) ; Less. Traite, p. 34 (1831) ; B'Orb. Voy. 



Am. Mericl, Zool. p. 55 (1835); Tschudi, Faun. Peruana, xy. 77 



(1845) ; Burtn. Th. Bras. ii. p. 41 (1856). 

 Circaetus brasiliensis, C'tiv. Peyne An.i. p. 328(1829). 

 Pandion caracara, G. R. Gray, hi Griff, ed. C'uv. An. Kinqd. vi. 



p. 235 (1829). 



* Brown's " Tawny Vulture " has been considered by some ornithologists to 

 be a Folyborus. The figure is not recognizable ; but if the locality, " Falkland 

 Islands," is correct, it is probably the young of Ibycfer aujitralis, as Polyborus 

 does not occ^ur there. The synonymy is as follows : — 



Tawny Vulture, Brown. III. Zool. pi. 1 (1766). 



Falco anibustus, Gm. S.N. i. p. 252 (1788, ex Brown). 



Vultur ambustus, Lath. Ind. Orn. i. p. 8(1790). 



Gypaetus ambustus, Baud. Traite, ii. p. 26 (1800). 



Spizaetus ambustus, Bonn, ef Vieill. Enc. Meth. iii. p. 1254 (1823). 



Polyborus ambustus, Sfrirkl. Orn. Si/n. p. 19(1855). 



