FAMILY TURDIDAE 



land, subspecifically distinct from the mainland forms, lives at sea level. 



All observers have commented on the similarity of the usual song of 

 this species and T. migratorius. The call, however, is entirely different 

 — a rather froglike guttural, harsh umk or yuck. It also gives a screechy 

 kyee-ee-yoo somewhat suggestive of the whining call of T. grayi. It 

 also, more rarely, gives a rich, repetitive song more suggestive of a 

 mimid or wren than a robin. 



Sometimes seen singly or in pairs, I have also found White-throated 

 Robins feeding in fruiting trees in groups of a dozen or more. Its diet 

 is mainly vegetable. Some of E. A. Goldman's notes of stomach con- 

 tents of specimens of T. a. daguae collected at Cana, Darien, are typi- 

 cal: one with the stomach two-thirds full had bits of a spider 3%, 5 

 drupes of Ficus sp. 85%, wild fruit skin 12%; one a fourth full had 

 the heads of two carabid larvae 5%, 2 seeds of an unidentified plant 

 and other fragments 65%, 1 drupe of Oleaceae sp. 30%; and one with 

 the stomach nearly empty had bits of a locustid 15% and bits of skin 

 of a wild fruit 85%. Willis (Living Bird, 1966, p. 202) has found 

 single individuals following army-ant swarms on Barro Colorado Is- 

 land September through January. 



TURDUS ALBICOLLIS CNEPHOSUS (Bangs) 



Merula leucauchen cnephosa Bangs, 1902, Proc. New England Zool. Club, 3, p. 92. 

 (Boquete, Volcan de Chiriqui, Panama.) 



Characters. — Upper surface brownish olive; bill yellowish. 



A female taken March 5, 1951, at Cerro Campana, Panama had the 

 iris light brown; prominent thickened eye-ring honey yellow; base of 

 maxilla and tip of culmen dull dark brown; rest of bill light greenish 

 olive; tarsus dull greenish olive; toes light brownish white. 



Measurements. — Males (10 from Chiriqui and Code), wing 114.6- 

 123.4 (119.5), tail 85.2-96.2 (90.3), culmen from base 21.3-23.7 

 (22.7), tarsus 28.6-31.1 (30.0) mm. 



Females (10 from Chiriqui, Code, and Province of Panama), wing 

 114.7-124.8 (119.1), tail 82.4-93.2 (88.7), culmen from base 22.0- 

 24.0 (22.9, average of 9), tarsus 29.8-32.0 (30.7) mm. 



Resident. Fairly common in Chiriqui, Veraguas, Code to western 

 Province of Panama on the Pacific slope in forest and forest edges of 

 middle elevations, at least occasionally wandering to lowlands. It is 

 also found in southwestern Costa Rica. Aldrich and Bole (Scient. 

 Publ. Cleveland Mus. Nat. Hist., vol. 7, 1937, p. 114), on the western 

 slope of the Azuero Peninsula, said "this species was first encountered 

 at Mariato River camp at 250 feet elevation, but became more abundant 



