1917.] Chapman, Distribution of BirdAife in Colombia. 241 



Wing Tail Tarsus Culmen 



Rio Frio, cf, 



9, 

 Buenos Aires, cf, 



" &, 

 Guiana, ad. 



(589) Micrastur guerilla interstes Bangs. 



Micrastur interstes Bangs, Auk, XXIV, 1907, p. 289 (Cartago, Costa Rica). 

 Micrastur guerilla interstes Hellm., P. Z. S., 1911, p. 1203 (N6vita). 



I follow Hellmayr in referring Choco specimens to this form. Adult 

 males from Las Lomitas and San Antonio agree essentially with them. A 

 Novita bird has the plumbeous of the back and wings with a brownish tinge 

 and the underparts are more coarsely barred and washed with buffy, dif- 

 ferences which probably indicate immaturity. San Jose, Dabeiba and 

 Salencio immature males have the upperparts light clove-brown, the under- 

 parts unbarred and with the nuchal collar ochraceous-buff. The flanks of 

 one bird and the thighs of the other have one or two black and white barred 

 feathers, indicating that the succeeding plumage would be that of the plum- 

 beous adult. 



An immature Salento bird is slaty black above, cream-buff with narrow 

 but well-defined black bars below, and the nuchal collar is white. A grow- 

 ing feather on the breast is white finely barred with black, similar to that 

 of the adult, indicating that this plumage also would be followed by that 

 of the plumbeous adult. Possibly this Salento specimen should be referred 

 to M. g. zonothorax. 



Dabeiba, 2; La Vieja, 1; Novita, 1 9 ad.; San Jose, 1 cf im.; Las 

 Lomitas, 1 cf ad.; San Antonio, 1 cf ad.; Salencio, 1 cf im.; Salento, 1 9 

 im. 



(593a) Farabuteo unicinctus harrisi (Avd.). 



Buteo harrisi Aud., Birds Amer. (folio), IV, 1837, pi. 392 (Mississippi). 



An adult male, taken at La Manuelita, April 18, 1911, agrees with Texan 

 examples and extends the known range of this form which appears not to 

 have been before recorded south of Panama. 



(597) Accipiter superciliosus (Linn.). ■ 



Falco superciliosus Linn., Syst. Nat., I, 1766. p. 128 (Surinam). 

 Accipiter tinus Scl. & Salv., P. Z. S., 1879, p. 541 (Remedies). 

 Accipiter superciliosus Hellm., P. Z. S., 1911, p. 1203 (Tad6). 



Barbacoas, 1; Puerto Valdivia, 1. 



