FAMILY TROGLODYTIDAE 



69 



below this, and the upper throat, white, with cheeks in some narrowly 

 streaked or spotted with gray; white of throat changing to ochraceous- 

 buff on foreneck and breast, deepening on sides, flanks, and undertail 

 coverts to tawny brown; edge of wing, scapulars, and underwing co- 

 verts white. 



Immature, colors somewhat duller, with the bars on wings and tail 

 less distinct. 



In the Canal Zone and adjacent parts of the Provinces of Panama 

 and Colon the Buff-breasted Wren may be found in the same wood- 

 lands as the paler-colored Plain Wren, Thryothorus modestus, but 

 avoids drier areas, being usually found near streams, or swampy or 

 damp woods. It is present eastward on both slopes through Darien and 

 San Bias to Colombia, with a local race in the Perlas group on Isla del 

 Rey and adjacent islands. Beyond the Isthmus of Panama, in tropical 

 South America, the species ranges widely with several races in the low- 

 lands of Colombia south to Brazil and Peru. 



THRYOTHORUS LEUCOTIS GALBRAITHII Lawrence 



Thryothorus Galbraithii Lawrence, Ann. Lye. Nat. Hist. New York, vol. 7, June 

 1861, p. 320. (Atlantic side on line of R.R. = Lion Hill, Panama Railroad, 

 Canal Zone.) 



Characters. — Dull brown dorsal surface, with tone more olive than 

 rufescent, as is T. 1. conditus. 



Male and female, taken at La Jagua, eastern Province of Panama, 

 March 22, 1961, had the iris wood brown; maxilla fuscous-black, ex- 

 cept on the cutting edge, which, with the mandible, was pale dull neutral 

 gray; tarsus and toes dusky neutral gray. 



Measurements. — Males (10 from Canal Zone, eastern Province of 

 Panama, San Bias, and Darien), wing 62.0-65.4 (63.6), tail 41.0-44.3 

 (42.8), culmen from base 18.5-20.6 (19.7), tarsus 23.2-24.9 (24.0) 

 mm. 



Females (10 from eastern Province of Panama, San Bias, and 

 Darien), wing 58.0-60.9 (59.6), tail 37.6-41.1 (39.3), culmen from 

 base 17.0-19.6 (18.0), tarsus 22.3-24.3 (23.5) mm. 



Resident. Locally common from the Canal Zone east on the Pacific 

 side through the eastern Province of Panama to Darien (at mouth of 

 Rio Tuquesa, on the Rio Chucunaque, and at El Real and Marraganti 

 on the Rio Tuira; Cerro Sapo) ; on the Caribbean slope from the north- 

 ern Canal Zone east through eastern Colon and San Bias (Mandinga, 



