274 BIRDS OF THE REPUBLIC OF PANAMA — PART 3 



green ; lower surface olive-yellow, barred indistinctly with slate-gray ; 

 wings, including under surface and tail, as in males. 



Immature, middle and greater coverts, outer webs of secondaries, 

 and inner primaries rufous. 



Measurements. — Males (8 from Chiriqui and Costa Rica), wing 

 59.1-65.2 (63.1), tail 37.2-48.5 (43.8), culmen from base 10.6-12.8 

 (11.7, average of 7), tarsus 15.5-16.4 (15.9) mm. 



Females (6 from Chiriqui and Costa Rica), wing 60.2-63.5 (61.1), 

 tail 42.6-46.1 (45.4), culmen from base 11.8-12.7 (12.1, average 

 of 5), tarsus 15.0-16.8 (16.3) mm. 



Resident. Local ; known from the higher levels of the volcano 

 in Chiriqui, from the Cerro Punta and Bambito area, on the western 

 face at 1580 to 1950 meters, and on the eastern side at Casita Alta 

 and Velo above Boquete, at 1675 to 2135 meters. 



The first report of the species for the Republic is a specimen in 

 the American Museum of Natural History, received from J. H. 

 Batty, collected September 13, 1901, marked Boquete. Eisenmann 

 in his notes reports it as not uncommon in the Bambito-Cerro Punta 

 area in humid woodland, usually in pairs in low second growth in 

 ravines. An immature male from Velo, taken at 1675 meters on 

 August 4, 1937, is reported by Blake (Fieldiana: Zool., 1958, p. 534) 

 from the Monniche collection. Another male in the National Museum 

 was collected by Dr. Frank Hartman at 2135 meters at Casita Alta, 

 February 11, 1949. C. Brooke Worth (Bird-Lore, 1939, pp. 279- 

 280) described the song, heard in the valley at Velo, reminiscent of 

 that of the field sparrow of eastern United States, as follows : "I 

 located the singer on a twig near the ground. Its song I wrote down 

 as soo-soo-zvee-hee-hee-hee-heet, the syllables being clear-cut, with 

 the final ones ascending slightly in pitch. . . . The singing resulted 

 in the arrival of another bird that perched for a moment alongside 

 the first one and then quietly flew away." 



Alexander Skutch (Publ. Nutt. Orn. Club, no. 7, 1967, pp. 76-80) 

 in Costa Rica found this form in "the cool, mossy mountain forests, 

 often in mixed flocks that include ovenbirds, woodcreepers, fly- 

 catchers, wood warblers, vireos and other small birds. ... It subsists 

 largely on insects which it catches as it darts against the foliage. Its 

 restless activity and the briskness of its movements contrast with the 

 more deliberate actions of its larger relatives." Two nests that he 

 saw were placed in the tops of slender-trunked trees at about 15 and 

 23 meters above the ground. Both were bulky globular structures 

 made of green moss and bits of other plants. In one that he saw 



