46 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



Juvenile, crown and side of head dull blackish brown; throat, fore- 

 neck, upper breast, hindneck, scapulars, and back dull grayish brown. 



An adult male taken at Las Palmitas, Los Santos, January 24, 1962, 

 had the eye yellow; bill, tarsus, and toes black. In a fully grown im- 

 mature male shot on the same day, the iris was duller yellow, and the 

 external edge of the gape honey yellow. Other markings were as in the 

 adult. 



Measurements. — Males (10 from Chiriqui to Darien), wing 163.0- 

 175.0 (167.5), tail 157.0-168.0 (162.1), oilmen from base 30.3-36.2 

 (33.1), tarsus 45.0-52.0 (47.8) mm. 



Females (10 from Chiriqui to Darien), wing 159.0-169.0 (164.3), 

 tail 154.0-161.0 (158.3), culmen from base 31.0-35.9 (33.7), tarsus 

 47.0-51.9 (50.1) mm. 



Figure 4. — Black-chested Jay, Chocho, Cyanocorax affinis zeledoni. 



Resident. Common in forested areas (including second growth) 

 throughout the Republic, from near the Costa Rican boundary in Chiri- 

 qui (Divala, Santa Clara) and Bocas del Toro (Rio Sixaola, Changui- 

 nola) including the Azuero Peninsula (Pedasi, Tonosi, Las Palmitas) 

 on both slopes to the Colombian boundary, to 1300 m elevation (near 

 El Volcan and 1600 m (above Boquete at Horqueta, Velo); 600 m 

 on Cerro Pirre (Cana) in Darien. 



As these jays range in forest and brushy cover, when these are 

 cleared in cultivation, the birds disappear. However, if the clearings 



