134 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



January 22 and 31, suggested T. grayi casius but with a slower delivery 

 and notes much higher on the scale. In early April 1976 Ridgely found 

 it common in forest, singing all day, a song of excellent quality; it ut- 

 tered a guttural call like birds of the western highlands. 



On March 23, 1962, I collected 2 male White-throated Thrushes on 

 Isla Brincanco, Islas Contreras. Both birds were in full breeding con- 

 dition and several times I heard their sweet robin song. I have tenta- 

 tively assigned them to the race coibensis, although with a larger series 

 subspecific differences may become clear. Eisenmann notes that bill 

 colors of these birds suggest intermediacy between the dark-billed birds 

 of Coiba and the yellow-billed western mainland birds. The Coiba race 

 of the Streaked Saltator, Saltator albicollis scotinus, is also known to 

 extend to Isla Brincanco. 



TURDUS ALBICOLLIS DAGUAE Berlepsch 



Turdus daguae Berlepsch, 1897, Orn. Monatsb. 5, p. 176. (San Jose, Rio Dagua, 

 Colombia.) 



Characters. — Undersurface sepia; upper surface ruddier than other 

 Panama races. 



A male taken January 31, 1961, on Cerro Pirre, Darien, had the iris 

 bright brown; thickened eyelid dull lemon yellow; maxilla and tip of 

 mandible black; base of mandible light olive-green; tarsus and toes 

 brownish gray. 



A male taken March 9, 1964, at Tacarcuna Village, Darien, had the 

 iris warm brown; thickened edge of eyelid bright, somewhat greenish 

 yellow; maxilla fuscous-black; cutting edge of mandible and gape dull 

 yellow; end of mandible and extreme base of rami fuscous, middle 

 section dull yellowish green; tarsus and toes dull, somewhat grayish 

 brown; claws somewhat darker. 



Measurements. — Males (10 from Darien, Panama, and Choco, Co- 

 lombia), wing 102.4-110.9 (108.2), tail 73.3-81.6 (77.3, average of 9), 

 culmen from base 19.0-21.6 (20.1, average of 9), tarsus 26.8-30.1 



(28.1) mm. 



Females (7 from Darien, Panama, and Choco, Colombia), wing 

 103.1-107.4 (105.6), tail 73.0-77.9 (75.4), culmen from base 20.4-21.8 



(21.2) , tarsus 27.1-29.6 (27.9) mm. 



Resident. Fairly common in eastern Darien on the Pacific slope. 

 Found also in western Colombia and Ecuador. The Smithsonian has 

 several specimens taken by E. A. Goldman between February and June 

 1912 at Cana, at elevations from 540 to 600 m, and I have collected 



