404 r.IRDS OF THE REPUBLIC OF PANAMA PART 3 



including axillars and under wing coverts, bright yellow ; inner webs 

 of wing feathers dull cinnamon-buff. 



Young, without crown spot ; similar to adult in general pattern 

 of coloration, but forehead white and the white superciliary band 

 broadly continuous across nape ; feathers of entire upper surface, 

 including wings and tail, edged broadly with cinnamon-rufous. 



Immature, feathers of back with a subterminal bar of dusky and 

 tip of dull cinnamon-buff ; without the concealed crown patch until 

 first complete molt. 



A male taken near Puerto Armuelles, Chiriqui, January 30, 1966, 

 had the iris dark brown ; bill black, with the inside of the mouth on 

 both maxilla and mandible very pale grayish white ; tarsus and toes 

 fuscous-brown ; claws black. 



A female, at Las Palmitas, Los Santos, January 21, 1962, had the 

 iris dark mouse brown ; bill black ; upper end of tarsus dusky neutral 

 gray, shading at center to black which continues over toes and claws. 



Measurements. — Males (13 from Chiriqui, Veraguas, Los Santos, 

 Canal Zone, Darien, and San Bias), wing 120.2-127.2 (123.5), tail 

 81.2-94.2 (87.5), culmen from base 31.2-36.1 (33.6), tarsus 19.0- 

 21.2 (20.2) mm. 



Females (10 from Chiriqui, Los Santos, Province of Panama, and 

 Bocas del Toro), wing 120.4-125.4 (122.5), tail 80.1-89.7 (85.3), 

 culmen from base 30.7-36.2 (33.1), tarsus 19.0-21.2 (20.5) mm. 



Weight. J* adult, 61.1 grams (R. S. Crossin). 



Resident. Common ; found throughout the Tropical Zone and the 

 lower Subtropical Zone in Chiriqui, regularly to 1280 meters near 

 El Volcan, less frequently to 1900 meters at Cerro Punta. Recorded 

 on Isla Cebaco in Golfo de Montijo, and Isla Rancheria (near Isla 

 Coiba). 



This is a common bird in the borders of forests, groves, and 

 scattered stands of trees, through the savannas and more open areas 

 of the Pacific slope and the eastern side of the Azuero Peninsula; in 

 groves and clearings elsewhere. It lives also, apparently in lesser 

 number, across the high treecrown in forest areas, but there is less 

 often seen because of the cover of leaves. Though it may dispossess 

 a kingbird from a high commanding perch on a palm spike, it rests 

 more frequently under partial cover of leaves. Apparently it does 

 not cross wide expanses of water as Isla Cebaco at the entrance of 

 Golfo de Montijo and Isla Rancheria near Coiba are the only islands 

 at all distant from the mainland on which I have found it. 



Boat-bills range singly or in pairs, scattered through their haunts, 



