1917.] Chapman, Distribution of Bird-life in Colombia. 247 



(629) Busarellus nigricoUis (Lath.). 



Falco nigricoUis Lath., Ind. Orn., 1, 1790, p. 35 (Cayana). 



Buteogallus nigricoUis Cass., Proc. Acad. N. S. Phila., 1860, p. 132 (R. Truando). 



BusareUus nigricoUis Allen, Bull. A. M. N. H., XIII, 1900, p. 130 (Bonda). 



R. Atrato, 2; Calamar, 1. 



(631) Urubitinga urubitinga (Gmel.). 



Falco urubitinga Gmel., Syst. Nat., I, 1788, p. 265 (Brasilia). 



Urubitinga mexicana Cass., Proc. Acad. N. S. Phila., 1860, p. 133 (Atrato). 



Two adults and one immature were collected by Mrs. Kerr in the Atrato 

 Valley. 



Salaqui, 1; Atrato River, 1; Monguido, 1. 



(634) Urubitinga schistacea (Sundev.). 



Asturina schistacea Sundev., Ofv. K. Vet. Akad. Forh., VII, 1850, p. 312 (Brazil). 

 Barrigon, 1 ad. 9 . 



(635) Urubitinga plumbea (Salv.). 



Leucopternis plumbea Salv., Ibis, 1872, p. 240, pi. viii (Ecuador); Hellm., 

 P. Z. S., 1911, p. 1204 (Sipi). 



Bagado, 1 ad. 9 ; Barbacoas, 1 ad. 9 . 



(642) Leucopternis semiplumbea Lawr. 



Leucopternis semiplumbea Lawb., Ann. Lye. Nat. Hist., N. Y., VII, 1861, p. 288 

 (Panama); Scl. & Salv., P. Z. S., 1879, p. 540 (Remedios); Hellm., P. Z. S., 1911, 

 p. 1204 (Juntas de Tamand). 



Inhabits the Pacific coast, Tropical Zone and eastward into the Cauca- 

 Magdalena region. 



An apparently adult male from Los Cisneros differs from three adults 

 (including the type) from Panama and two from Costa Rica in having two 

 bands on the tail, the wing-quills more definitely barred and the feathers 

 of the crown and back with more white at the base. A Baudo adult is 

 similar but the subterminal tail-band is not so definite. Evidently, there- 



