FAMILY TYRANNIDAE 543 



of the Azuero Peninsula, to the lower Rio Bayano near Chepo, 

 eastern Province of Panama ; on the Caribbean slope recorded in 

 western Bocas del Toro, northern Code, the Canal Zone, and adjacent 

 eastern Colon; to 1300 meters on Cerro Pando, Chiriqui ; Isla Coiba. 



These small, active flycatchers are inhabitants of thickets and 

 undergrowth, ranging usually in pairs at the borders of open forest, 

 pastures, and cultivated areas. In Chiriqui, I found them in weed- 

 grown brush on the Rio Corotu, west of Puerto Armuelles, and near 

 Alanje, below Concepcion. Higher, in the foothills and lower moun- 

 tains, they were fairly common near Buena Vista (650 meters), and 

 along the base of Cerro Pando, beyond the Rio Chiriqui Viejo (1300 

 meters). They were fairly common also near Sona, Veraguas, and 

 on the eastern side of the Azuero Peninsula in the Province of Her- 

 rera (La Cabuya, Pese), and in Los Santos (Tonosi). In the low- 

 lands of Code I encountered them at El Potrero. They range locally 

 in the southern Canal Zone ( Chiva Chiva, Curundu), and are re- 

 corded farther east in the eastern Province of Panama at La Jagua, 

 and on the lower Rio Bayano beyond Chepo. 



On the Caribbean side, one was taken at Almirante, by one of the 

 collectors for the Gorgas Laboratory, the only record for that area. 

 In 1952, they were fairly common at El Uracillo, on the Caribbean 

 slope in northern Code Province near the headwaters of the Rio 

 Indio. They are found locally in the lower Chagres Valley in the 

 Canal Zone and in adjacent eastern Colon. 



On Isla Coiba they ranged in small number in the thickets back 

 of mangroves, and also in second growth in abandoned fields. On 

 several occasions I found them visiting berry-bearing trees in company 

 with other small birds. 



Alexander Skutch (Pac. Coast Avif., no. 34, 1960, pp. 319-321) 

 in southwestern Costa Rica, in the record of six nests, found them 

 breeding irregularly from February through May and June to Sep- 

 tember and December. The nests were "substantial open cups, com- 

 posed of light-colored vegetable fibers, grass blades, shreds of plant 

 epidermis and the like, with more or less green moss or selaginella 

 attached to the outer wall." Two eggs in one nest were pure white, 

 with measurements of 17.1x13.1 and 17.5x13.1 mm. 



In the notes of Major-General G. Ralph Meyer there is record 

 of a nest at the Summit Gardens, Canal Zone, on September 20, 1941. 

 It was made of coarse and fine grass placed in the fork of a small 

 tree about 2 meters above the ground. The two eggs measured 17.3 X 

 12.9 and 17.0x12.7 mm. 



