FAMILY TYRANNIDAE 42/ 



Measurements — Males (10 from Chiriqui and Canal Zone), wing 

 91.5-96.3 (94.2), tail 86.3-92.0 (88.8), culmen from base 21.0- 

 22.5 (21.7), tarsus 23.2-24.7 (23.8) mm. 



Females (10 from Chiriqui, Code, Los Santos, Canal Zone, and 

 Province of Panama), wing 85.5-88.9 (87.5), tail 80.7-88.6 (83.8), 

 culmen from base 21.0-24.0 (22.1). tarsus 22.5-24.6 (23.2) mm. 



Resident. Common throughout the tropical lowlands on both 

 slopes, from western Chiriqui and western Bocas del Toro (Al- 

 mirante, Cocoplum) eastward, including the Azuero Peninsula, to 

 Colombia; to 1280 meters elevation near El Volcan and 1220 meters 

 at Boquete, Chiriqui. Islas Parida, Brincanco. and Afuerita, in Golfo 

 de Chiriqui ; islas Coiba and Rancheria ; Isla Gobernadora, Golfo de 

 Montijo ; Isla Iguana, off the coast of Los Santos ; islas Taboga, 

 Taboguilla and Urava ; islas Pacheca, Saboga, Bayoneta, Malaga, 

 Vivienda, Rey, Canas, Santelmo, Moreno, Pedro Gonzalez and San 

 Jose, Archipielago de Las Perlas. 



This, one of the more plainly colored of the Yellow-breasted Fly- 

 catchers called pcchi-amarillo from the yellow color of the under 

 surface, is widely distributed through the Tropical Zone from the 

 Costa Rican boundary eastward throughout the lowlands of Panama 

 and much of Colombia. In southwestern Chiriqui I found this bird 

 in 1966 near Puerto Armuelles. where it had been taken earlier (No- 

 vember 26, 1929) by Mrs. Davidson. In adjacent Costa Rica, Slud 

 (Amer. Mus. Nat. Hist. Bull. 128, 1964, p. 250) lists it at Rincon 

 de Osa on Golfo Dulce. Sassi (Temminckia, vol. 4, 1939, p. 183) 

 collected a female at Puerto Jimenez, on the end of the Peninsula de 

 Osa at the entrance of this body of water. These records mark the 

 western limit of the race on the Pacific Coast. In Bocas del Toro 

 (where it had not been reported previously), in 1958 on February 11 

 I took one on Cayo Roldan. and February 22 recorded five (two 

 collected) on Isla Pastores, both localities being in the southern part 

 of Bahia Almirante. At the eastern end of the Republic they were 

 common near Jaque in March and April, 1946. On the Caribbean 

 slope in the Comarca de San Bias this form is recorded at Mandinga, 

 Bahia Caledonia, and Puerto Obaldia. 



They are most common at the borders of woodland, and in brushy 

 pastures, ranging also at the inner margins of mangrove swamps, 

 and through the open gallery forest over inland hills. They are not 

 seen in the denser stands where shade is heavy, but here may range 

 in small number over the open surface of the high tree crown. This 

 latter habitat was common for them in the extensive forests of Isla 



