1917.] Chapman, Distribution of Bird-life in Colombia. 239 



Generally distributed throughout the Tropical Zone and occurring also 

 on the Bogota Savanna. 



La Manuelita, 1; Bogota Savanna, 1. 



(575) Ibycter americanus {Bodd.). 



Falco ameticanus Bodd., Tabl. PI. Enl., 1783, p. 25 (Cayenne). 



Ibycter aquilinus Cass., Proo. Acad. N. S. Phila., 1860, p. 133 (Turbo; R. Tru- 

 ando). 



Ibycter americanus ScL. & Salv., P. Z. S., 1879, p. 541 (Medellin; Remedies; 

 Nech^). 



Doubtless distributed throughout the Tropical Zone. We have speci- 

 mens from the Atrato and lower Cauca Valleys, and Caquet^ region. 

 Salaqui, 1; Puerto Valdivia, 1 ; La Morelia, 3. 



(580) Milvago chimachima ( VieilL). 



Polyborus chimachima Vibill., Nouv. Diet. d'Hist. Nat., V, 1816, p. 269 (Para- 

 guay). 



Milvago chimachima WTATT,'lbis, 1871, p. 382; Scl. & Salv., P. Z. S., 1879, 

 p. 541 (Cauca); Robinson, Flying Trip, p. 155 (Barranquilla; R. Magdalena); 

 Allen, Bull. A. M. N. H., XIII, 1900, p. 131 (Valencia). 



Of general distribution throughout the Tropical Zone and ranging up- 

 ward to the lower border of the Subtropical Zone. The band across the 

 primaries is huffier in Colombian specimens than in three from Chapada, 

 Matto Grosso, but I have not sufficient material to determine whether this 

 difference is constant. 



San Antonio, 1; CaH, 1; La ManueHta, 1; La Palma, 1; Chicoral, 1; 

 Honda, 1; Calamar; Barrigon, 1. 



(582) Circus hudsonius (Linn.). 



Falco hudsonius Linn., Syst. Nat., I, 1766, p. 128 (Hudson Bay). 

 Circus hudsonicus Sol. & Salv., P. Z. S., 1879, p. 539 (Medellin). 



An immature male was collected by Mrs. Kerr on the Atrato River, 

 Nov. 23, 1909. A record from Medellin appears to be the only other known 

 instance of this 'bird's occurrence in South America. 



