l86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



completed nest found on Barro Colorado Island on June 29, 1951, as 

 made of twigs, shallow, and placed over 20 meters from the ground, 

 in a crotch in a tall cedro espinoso {Bomhacopsis fendleri), where it 

 was concealed from above but not from the side. The female began 

 incubation on July 3. The male drove at a large woodpecker, at white- 

 faced monkeys, and Araqari toucans, and chased them away, but a 

 Swainson's toucan was seen to intimidate the female and take one 

 &gg. A few days later the nest was found deserted. The egg, seized 

 by the toucan "appeared whitish speckled with brown," which agrees 

 with published descriptions of the eggs of the related Harpagus 

 diodon of South America, 



The double-toothed kite is silent in the main except when nesting, 

 when they utter high-pitched calls, in shrill intonation like those of 

 other small hawks. 



While these kites are found most often in the tropical zone, they 

 range in Chiriqui to 1,300 meters in the forested valleys. I was in- 

 terested to collect one in heavy forest on Isla Coiba. 



The typical form, Harpagus bidentatus bidentatus (Latham), which 

 ranges from eastern Colombia, east of the Andes, Venezuela, and 

 Trinidad to eastern Bolivia and south central Brazil, is less heavily 

 barred on the lower surface. 



LEPTODON CAYANENSIS CAYANENSIS (Latham): Cayenne Kite; Gavilan 



Cabecigris 



Falco cayanensis Latham, Index Orn., vol. 1, 1790, p. 28. (Cayenne, French 

 Guiana.) 



In the hand these hawks differ from any others found in Panama 

 by the short, heavy tarsus, which is 42 to 50 mm. long, feathered for 

 nearly half its length. In life the gray head, dark back, banded tail 

 and light-colored undersurface are diagnostic. 



Description. — Length 450 to 525 mm. Adult, head gray, paler on 

 the foreneck and throat; rest of upper surface dark gray with a 

 bluish cast ; primaries and secondaries with very faintly indicated 

 lighter gray bands ; tail blackish, tipped narrowly with grayish white, 

 with 2 narrow bands of light gray, and a third broken one of variable 

 extent, more or less concealed by the upper tail coverts ; under surface 

 white, with a tinge of gray; flanks and tibia spotted and streaked 

 with dark gray; under wing coverts grayish black; undersurface 

 of wing blackish banded with grayish white. 



Immature in light phase, crown and upper surface brownish black ; 

 tail with two bands of brownish gray, and a broad tip of light brown ; 



