FAMILY ACCIPITRIDAE 243 



and narrow tip of white ; a black line below the brown on tlie side of 

 the head ; under surface, including under wing, white ; throat and 

 foreneck pure white, elsewhere banded heavily with black. 



Immature, head and neck white, washed more or less with cin- 

 namon; mainly mouse gray above and white below, with black bars 

 restricted to sides, legs, tail, and undersurface of wing. 



An adult male taken at the mouth of Rio Tuquesa, Darien, March 

 27, 1959, had the iris bright yellow ; loral area (bare except for 

 bristles) bluish gray; bill black, except for neutral gray shading on 

 side of maxilla at base (below the level of the upper margin of the 

 nostril), and on side of mandible at base; toes yellow basally, shaded 

 distally with greenish ; claws black. 



Measurements (adapted from Friedmann, U. S. Nat. Mus. Bull. 50, 

 pt. 10, p. 446).— Males, wing 338-349 (340), tail 244-268 (255.6), 

 culmen from cere 25.5-29 (27.1), tarsus 87-92 (89) mm. 



Females, wing 353-388 (377.8), tail 266-290 (281.6), culmen from 

 cere 27-31.5 (30), tarsus 89.5-100 (94.1) mm. 



Resident. Uncommon, in regions of heavy forest, ranging from 

 the lowlands to above 1,500 meters in the mountains of Chiriqui 

 and Darien. 



Though these birds are widely distributed there are no records as 

 yet from the Azuero Peninsula. 



I have seen this handsome hawk soaring over an opening made by 

 a fallen tree on Barro Colorado Island (Feb. 8, 1950), and there 

 is a specimen from that reserve in the University of Michigan 

 Museum, taken on August 17, 1927, by J. Van Tyne. One in the 

 U. S. National Museum from near Gamboa, C. Z., was collected 

 November 25, 1960, by N. Gale and C. M. Keenan. Near Chepo, on 

 April 26, 1949, one shot by W. M. Perrygo was lured within range 

 by calls to attract smaller birds. A living individual presented to the 

 National Zoological Park by Dr. H. M. Mitchell was captured on 

 the Rio Maestra, eastern Panama, in January 1961. In the woodland 

 along the Rio Chucunaque, near the Tuquesa, a pair ranged in one 

 section of forest, hunting usually through the middle branches, below 

 the tree crown. I shot the male here on March 27, 1959. Goldman 

 collected one at over 1,500 meters elevation at the head of Rio 

 Limon on Cerro Pirre on April 19, 1912. H. von Wedel secured 

 one March 4, 1938 (sex not marked), "24 miles inland" from 

 Cricamola, Bocas del Toro, and a female June 15, 1932 at Puerto 

 Obaldia, San Bias. 



The nest and eggs have not been reported in literature that I 

 have seen. They are said to feed on reptiles, but also take birds. On 



