34-0 BIRDS OF THE REPUBLIC OF PANAMA PART 2 



Measurements. — Males (11 from Costa Rica and Panama), wing 

 47.4-51.3 (49.5), tail 26.0-28.9 (27.3), culmen from base 14.5-16.5 

 (15.4) mm. 



Females (10 from Costa Rica and Panama), wing 45.6-47.6 (46.5), 

 tail 25.3-27.4 (26.3), culmen from base 14.4-16.9 (15.5) mm. 



Resident. Found in the Subtropical Zone of the high Caribbean 

 slope, between 1,500 and 2,100 meters elevation, in Bocas del Toro and 

 northern Veraguas. 



This small hummingbird at present is little known. W. W. Brown, 

 Jr., collected the first reported from Panama in the Caribbean slope 

 forests of Bocas del Toro, beyond Boquete, in June 1901 (Bangs, 

 Proc. New England Zool. Club, vol. 3, 1902, p. 29). Monniche secured 

 a male at Camp Holcomb, in this same area, July 15, 1935 (Blake, 

 Fieldiana: Zool., vol. 36, 1958, p. 518). From Veraguas, Arce for- 

 warded specimens taken on the Cordillera del Chucu beyond Santa Fe. 

 One that he collected, now in the British Museum, marked from Calo- 

 bre, must be wrongly labeled, as that point, at the base of the mountains 

 on the Pacific side northeast of Santiago, is far down in the tropical 

 lowlands, only 250 meters elevation above sea level. 



The black-bellied hummingbird is an inhabitant of humid forests 

 on the higher slopes of the mountains. As yet little is reported on 

 its habits. Dr. Alexander Skutch (Publ. Nuttall Orn. Club, no. 7, 

 1967, pp. 40-41) at Montana Azul, in the Cordillera Central of Costa 

 Rica, found a female building a nest, on July 31, 1937, about 2 meters 

 from the ground in a shrub standing in second growth. The small 

 cup, sheltered from frequent rains by broad leaves above, was made 

 "chiefly of brown scales (ramenta) from the fronds of large ferns 

 . . . sparingly decorated on the outside with bits of moss and lichens. 

 Much more moss was attached to the exterior after the eggs were 

 laid." The 2 tiny white eggs hatched after about 16 days incubation. 

 A second nest was built in forest on a horizontal branch of a shrub 

 about 4 meters from the ground. On March 1, 1938, when found, it 

 held 2 naked nestlings. 



ELVIRA CHIONURA (Gould): White-tailed Emerald, Colibrl 

 Coliblanco 



Trochilus (Thaumatias?) chionura Gould, Proc. Zool. Soc. London, pt. 18, 

 1850 (Feb. 28, 1851), p. 162. (Base of Volcan de Chiriqui, 600-900 meters 

 elevation, north of David, Chiriqui.) 



Small ; tail pure white, with broad dark tip. 



Description. — Length 80-88 mm. Adult male, above, including the 



