FAMILY ACCIPITRIDAE I93 



Immature (rufous phase), crown fuscous; rest of upper surface 

 hazel brown, with concealed areas of dull brown and white bases ; 

 tail hazel barred with black; below white, barred with light brown, 

 and washed with bright hazel on under side of wing, sides, center of 

 breast, and outer side of tibia. 



An adult male, taken on the Rio Tuira, had the iris bright orange- 

 red; rim of eyelids, bare skin around eyes, lores, cere, gape, and 

 mandibular rami, bright yellow; maxilla (except base), and extreme 

 tip of mandible, dusky neutral gray; base of maxilla below nostril, 

 and rest of mandible dull buffy white; tarsus and toes yellow, the 

 toes slightly brighter ; claws black. 



Measurements. — Males (3 from Panama and northwestern Colom- 

 bia), wing 130.3-132.5 (131.5), tail 86.7-92.9 (89.9), culmen from 

 cere 10.8-11.5 (11.1), tarsus 40.8-42.2 (41.3) mm. 



Female (1 from Panama), wing 149.7, tail 105.7, culmen from cere 

 12.7, tarsus 45.0 mm. 



Resident. Rare ; found in forested areas in the tropical zone. 



This is a little-known species, small in size, that has been recorded 

 seldom. McLeannan collected one early in his work, that is presumed 

 to have come from near Lion Hill (Lawrence, Ann. Lye. Nat. Hist. 

 New York, vol. 7, 1862, p. 462). Arce secured one a few years later 

 near Santiago, Veraguas (Salvin, Proc. Zool. Soc. London, 1867, p. 

 158). Hasso von Wedel shot a male at Obaldia, San Bias (Griscom, 

 Bull. Mus. Comp. Zool., vol. 72, 1932, p. 313). There is an immature 

 bird (a female from its size), not previously reported, in the Na- 

 tional Museum, collected on February 10, 1889, by H. T. Heyde in 

 forest on the Atlantic slope in the Cascajal area of northern Code. 



I have found the species twice, first on February 22, 1959, in heavy 

 forest at Boca de Paya, on the Rio Tuira, Darien. I was watching 

 small birds moving among leaves a few feet over my head, when one 

 of these little hawks swooped in, seized one of them and then flew 

 to a perch 50 meters distant, holding its prey in its feet. I shot the 

 hawk immediately, and as it fell the little bird flew away, apparently 

 unharmed. 



On March 9, 1961, on the Rio Pequeni above the Candelaria Sta- 

 tion, I had a similar experience when one of these small hawks seized 

 an arrocero immediately in front of me and alighted with it on a 

 branch. My companion, who was ahead, shot, and again the little 

 bird, its prey, flew away unharmed. The hawk was another male, 

 somewhat younger, as there were still two chestnut feathers with 

 dusky bars in the scapulars of one side. The colors of the side of 

 the head and of the tarsus also were slightly duller than in the adult. 



