392 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



green on outer web; sides, flanks and sides of abdomen same bright 

 green; rest of undersurface lemon yellow; underwing coverts white. 



Adult female, upper surface like male, but yellow on crown replaced 

 by bright light green; center of belly to undertail coverts pale yellow, 

 not sharply divided from rest of undersurface, which is light green. 



Immature male, like female. 



A female collected at Volcan de Chiriqui, Chiriqui, on March 2, 1965, 

 had the iris dark brown; maxilla, except base, and extreme tip of mandi- 

 ble black; base of maxilla below nostril and rest of mandible dull light 

 green; tarsus and claws brownish neutral gray; claws fuscous-brown. 



Measurements. — Males (10 from Chiriqui and Costa Rica), wing 

 69.8-78.8 (75.8), tail 40.5-50.8 (44.6), culmen from base 10.2-12.0 

 (11.2), tarsus 16.2-18.9 (17.4) mm. 



Females (10 from Chiriqui and Costa Rica), wing 71.8-76.5 (74.1), 

 tail 37.6-43.7 (40.5), culmen from base 10.2-11.4 (10.6), tarsus 16.7- 

 18.5 (17.6) mm. 



Resident. Uncommon in the highlands of Chiriqui and Veraguas, 

 where it inhabits clearings and forest borders. W. W. Brown, Jr., 

 collected it at Boquete and Volcan de Chiriqui between 1200 and 2250 

 m (Bangs, Proc. New England Zool. Club, vol. 3, 1902, p. 64) and 

 Monniche found it at the latter location between 1590 and 2040 m 

 (Blake, Fieldiana: Zool., vol. 36, no. 5, 1958, p. 564). Ridgely (in lift.) 

 encountered it at 1050 m on the slopes above the Fortuna Dam site in 

 central Chiriqui, on March 4, 1981. In Veraguas, Arce collected it at 

 Chitra, Calovevora, and Calobre (Salvin and Godman, Biol. Centr.- 

 Amer., Aves, vol. 1, (pt. 26), 1883, p. 254); here it is found down to 

 750 m (Ridgely, 1976, p. 314). I have seen them as high as 2370 m at 

 Volcan de Chiriqui. This race, callophrys, which is also found in Costa 

 Rica, is simply a strongly marked race of occipitalis, which occurs from 

 southeastern Mexico to northern Nicaragua (Hellmayr, Field Mus. 

 Nat. Hist., Zool. Ser., vol. 13, pt. 9, 1936, pp. 13-14). 



At Cerro Punta, Chiriqui, on March 4, 1955, I found 3 or 4 of these 

 birds working quietly through the higher branches of a tall tree stand- 

 ing in a pasture at 2160 m on the Boquete Trail above Bajo Grande. 

 The one 1 collected was a female about to lay. The stomach was a mere 

 excrescence on the side of the alimentary canal, but appeared heavier 

 and somewhat better developed than in the euphonias. The call note 

 is a high-pitched, slow whistle, to which they respond when it is imi- 

 tated. Ridgely (op. cit) mentions a "characteristic nasal call, to some 

 suggestive of the yapping of a small dog, enk-enk-enk-enk." Skutch 

 (Pac. Coast Avif. no. 31, 1954, pp. 252-258), who has studied this 



