2l8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I50 



Measurements. — Males (11 specimens from Honduras, Costa 

 Rica, and Panama), wing 336-358 (346), tail 209-226 (215), culmen 

 from cere 25.1-29.0 (26.6), tarsus 82.0-93.3 (85.8) mm. 



Females (3 specimens from Panama), wing 350-377 (367), tail 

 215-231 (221), culmen from cere 27.5-28.9 (28.1), tarsus 83.8-87.5 

 (85.4) mm. 



Resident. Fairly common in forested areas in the tropical zone of 

 both slopes; less often in the lower subtropical zone; to 1,250 meters 



Fig. 43. — White hawk, gavilan bianco, Leucopternis alhicollis costaricensis. 



elevation in Chiriqui (Bajo Mono, near Boquete), Veraguas (Cordil- 

 lera de Tole), on the high divide at 900 meters at Cavulla, on the 

 base of Cerro Viejo, head of Rio Mariato, western slope of the 

 Azuero Peninsula, and Code (above El Valle) ; Isla Cebaco. 



This beautiful bird, one of the most attractive of its family, when 

 observed resting on some dead stub in early morning sun appears 

 pure white, and it is only on close scrutiny, or as it flies, that the 

 black pattern of wings and tail is seen. In the forest, which is its 

 normal haunt, ordinarily it rests below the high tree crown, where 

 its colors in the play of light and shadow as seen from below are far 

 from conspicuous. And often the birds stand on huge, sloping limbs 

 that are covered with epiphytes, completely hidden from underneath. 



