FAMILY VIREONIDAE 



207 



of the logging road at Corotu the song I heard on February 12, 1966, 

 was a three-note whistle. To the east, in the Canal Zone I have heard 

 a three-syllabled whu-whu-whu at Juan Mina on January 10, 1955, 

 and at Chiva Chiva on December 29, 1963. 



SMARAGDOLANIUS PULCHELLUS VIRIDICEPS (Ridgway) 



Vireolanius pulchellus viridiceps Ridgway, Proc. Biol. Soc. Washington, vol. 16, 

 1903, p. 108. (Panama.) 



Characters. — Blue only on hindneck; rest of upper surface parrot 

 green, less yellowish green than in verticalis. 



A male collected at Charco del Toro, Rio Maje, eastern Province of 

 Panama on March 27, 1950, had the iris brown; maxilla black; mandi- 

 ble light neutral gray, darker toward base; tarsus, toes, and claws 

 neutral gray; inside of mandible like exterior; tip of tongue horn color; 

 rest of inside of mouth including basal part of tongue black; tongue 

 deeply bifid. 



A female collected March 31, 1951, on Cerro Agua at El Valle, 

 Code, had the dorsal pteryla broad in the center of the back and inter- 

 rupted posteriorly so that the lower end presents a broad "V." 



Measurements. — Males (5 from Colon, Province of Panama, and 

 Canal Zone), wing 67.8-71.2 (69.5) , tail 43.0-48.1 (45.2), culmen from 

 base 17.9-20.0 (18.7, average of 4), tarsus 21.1-23.6 (21.9) mm. 



Females (5 from Code, Province of Panama, and Canal Zone), 

 wing 65.0-71.0 (69.8), tail 39.8-46.9 (43.7), culmen from base 16.8- 

 20.5 (18.1), tarsus 20.4-22.2 (21.5) mm. 



Resident. Common in forest and tall second-growth woodland in 

 the more humid areas on the Pacific slope from western Chiriqui to 

 eastern Province of Panama; in the Canal Zone it has been commonly 

 recorded from both slopes. It also occurs in southwestern (Pacific 

 slope) Costa Rica. Specimen records are few, since this bird is ex- 

 tremely difficult to collect as, when singing, it perches motionless in the 

 tops of tall trees; fortunately it gives a distinctive three- or four-note 

 whistle with what Chapman (My Tropical Air Castle, 1929, p. 240) 

 calls "a tireless persistence." The few specimens in the Smithsonian 

 collections include 1 collected by Arce at Calobre in Veraguas and re- 

 cent ones from El Valle in Code, Charco del Toro, and Cerro Chucanti 

 (at 510 m on the northwest slope of Serrania de Maje) in the Province 

 of Panama; Cerro Galera, Albrook Air Force Base, and Barro Colo- 

 rado Island in the Canal Zone; and the Peluca Hydrographic Station in 



