248 Bulletin American Museum of Natural History. [Vol. XXXVI, 



fore, these birds resemble two specimens from Remedies, Antioquia, men- 

 tioned by Salvin and Godman (Biol. Cent. Am., Aves, III, 85). These 

 writers, however, also record a specimen from Veragua in which the tail is 

 two-banded, and it is not clear, therefore, whether the Colombian specimens 

 represent a new race or a phase of plumage. 

 Bagado, 1; Los Cisneros, 1. 



(649) Lophotriorchis isidori (Des Murs). 



Falco isidori Des Murs, Rev. Zool., 1845 (May), p. 175. 



Spizaetus isidorii Scl. & Salv., P. Z. S., 1879, p. 540 (Dept. Antioquia). 



Lophotriorchis isidorii Allen, Bull. A. M. N. H., XIII, 1900, p. 130 (Bonda). 



Paramillo Trail, W. Andes (11,000 ft.), 1. 



(651) Spizaetus ornatus {Baud.). 



Falco ornatus Datjd., Trait6, II, 1800, p. 77 (Cayenne). 

 Spizaetus ornatus Scl. & Salv., P. Z. S., 1879, p. 540 (Remedies). 



Doubtless occurs throughout the Tropical Zone. 

 Atrato River, 1; Puerto Valdivia, 1; La Morelia, 1. 



(653) Spizaetus tyrannus (Wied). 

 Falco tyrannus Wied, Reis. Braz., I, 1820, p. 300 (Rio Belmonte, Brazil). 

 Puerto Valdivia, 1. 



(654) Herpetotheres cachinnans cachinnans (Linn.). 



Falco cachinnans Linn., Syst. Nat., I, 1758, p. 90 ("Amer. meridionali"; Ber- 

 lepsch substitutes Surinam; cf. Nov. Zool., XV, p. 290). 



Herpetotheres cachinnans Scl. & Salv., P. Z. S., 1879, p. 541 (Cauca; Remedios); 

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



Occurs throughout the Tropical Zone, except on the Pacific coast, where 

 it is represented by a smaller, more richly colored form for which I have pro- 

 posed the name Herpetotheres cachinnans fidvescens. Specimens from both 

 the Cauca and Magdalena Rivers are clearly referable to true cachinnans of 

 which I have seen three specimens from Surinam in the Penard Collection. 



Rio Frio, 1; Honda, 2; Villavicencio, 1; Barrigon, 1. 



