240 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



taken in the heavy forests of Chanchamayo, which therefore is the 

 definite locality. Tschudi (p. xiii) locates the Rio Chanchamayo as 

 a stream in northern Junin that joins the Rio Paucartambo to form 

 the Rio Perene. 



SPIZAETUS TYRANNUS SERUS Friedmann: Black Hawk Eagle; Aguila 



Crestuda Negra 



Spisaetus tyranmis serus Friedmann, Smithsonian Misc. Coll., vol. Ill, no. 16, 

 Feb. 28, 1950, p. 1. (Rio Indio, near Gatun, Canal Zone, Panam4.) 



A black, crested eagle, with relatively long tail. 



Description. — Length, 570 to 680 mm. Head with a prominent, 

 rather bushy crest of numerous broad-ended feathers, without the 

 considerably elongated central plumes found in Spisaetus ornatus; 

 tarsus feathered nearly to the toes ; tail three- fourths as long as wing 

 or more. Adult, black, with feathers of crown, crest, throat, and upper 

 back white basally; tail with 3 broad bars and narrow tip that are 

 gray above, white underneath; under tail coverts and legs barred 

 heavily with white, the latter to the lower end of the tarsus; sides 

 usually barred lightly with white ; under wing coverts marked exten- 

 sively with white; under surface of primaries and secondaries with 

 wide white bars. 



Immature, brownish black; crown streaked widely with white to 

 deep buff; lower back, rump, and upper tail coverts barred with 

 white ; breast brown, with black shaft streaks, the feathers edged and 

 tipped with white; lower breast, abdomen, sides, legs, and under 

 tail coverts barred with white. 



Measurements. — Males (5 from Costa Rica, Panama and Colom- 

 bia), wing 371-383 (378.2), tail 291-312 (302.8), culmen from cere 

 27.3-30.2 (28.4), tarsus 78.1-86.0 (82.0) mm. 



Females, (3 from Panama and Venezuela), wing 390-393 (391.2, 

 average of 2), tail 296-311 (303), culmen from cere 29.5-30.3 (30.0), 

 tarsus 84.6-92.0 (87.9) mm. 



According to L. L. Jewel (Stone, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1918, p. 250) a female taken at Gatun, February 4, 1912, had 

 the "iris bright orange, bill blue-black, cere slaty, toes yellow." 



Resident. Uncommon, in areas of heavy forest, mainly in the 

 tropical zone, but recorded in western Chiriqui to 1,650 meters. 



Definite records are as follows : 



CHiRiQuf : Lerida, May 20, 1933 (Blake, Fieldiana: Zool., vol. 36, 1958, p. 



507). 

 Veraguas: Calobre (Salvin, Proc. Zool. Soc. London, 1870, p. 215). 

 BocAs DEL ToRO: Changuinola, Sept. 29, 1927; Fruitdale, Nov. 18, 1928 



(Peters, Bull. Mus. Comp. Zool., vol. 71, 1931, p. 309). 



