130 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



11. Undersurface brown 



Undersurface gray or blackish 



12. Upper surface dark brown. 



12 

 13 



Pale-vented Robin, Turdus fumigatus obsoletus. p. 135 



Upper surface light brown. 



Clay-colored Robin, Turdus grayi casius. p. 137 



13. Undersurface gray. 



Mountain Robin, Turdus plebejus plebejus. p. 140 



Undersurface blackish. 



Sooty Robin, Turdus nigrescens. p. 142 



TURDUS ALBICOLLIS Vieillot: White-throated Robin, 

 Casca Gargantiblanco 



Turdus albicollis Vieillot, 1818, Nouv. Diet. Hist. Nat., nouv. ed., 20, p, 227. 

 (Brazil = Rio de Janiero.) 



Rather large; robinlike; upper throat boldly streaked dusky and 

 white, upper chest pure white. 



Description. — Length 190-226 mm. Adult (sexes alike), upper sur- 

 face from crown to rump brownish olive; scapulars, wing coverts, and 

 secondaries brownish olive; primaries and rectrices darker brown; side 

 of face brownish olive; throat boldly streaked dusky and white, with 

 white continuing on to upper chest; rest of undersurface tawny-olive, 

 to abdomen and undertail coverts, which are white or pale buff; under- 

 wing coverts tawny-olive. 



Juvenile, scapulars and feathers on upper back veined and tipped 

 russet; undersurface from throat to breast, and sometimes to abdo- 

 men, spotted dusky. 



The White-throated Robin is a wide-ranging species, found from 

 northern Mexico through Central America and into South America as 

 far as southernmost Brazil, Paraguay, and northern Argentina in Mis- 

 iones Province. In Panama it occurs mainly on the Pacific slope, in 

 Chiriqui, Veraguas, the western side of Azuero Peninsula, in Code at 

 El Valle, and eastern Province of Panama at Cerro Campana, and in 

 eastern Darien. There are several recent sightings from Barro Colo- 

 rado Island after the nesting season (Ridgely, 1976, p. 274) and else- 

 where in the Canal Zone (Toucan, May 1977, pp. 3-4). This species 

 is common in forest and forest borders in the foothills and lower high- 

 lands. Aldrich and Bole (Scient. Pub. Cleveland Mus. Nat. Hist., vol. 

 7, 1937, pp. 25, 26) found it common in rain forest and cloud forest 

 (900 m and above) on the western slope of the Azuero Peninsula, and 

 Worth (Auk, 1939, pp. 307-308) called it common at 168 m in forests 

 and clearing near Rio Gariche, Chiriqui. The population on Coiba Is- 



