FAMILY TURDIDAE 



133 



They were heavily spotted with small dots of russet, so thickly clus- 

 tered at the blunt end as to become confluent." Their measurements 

 were 29x21 and 28x22 mm. The nest was nearly 2 m from the ground 

 in the crotch of a small coffee tree, with a foundation of coarse dead 

 grass and a superstructure of living green moss. The cup-shaped cavity 

 was lined with fine rootlets. The eggs from this nest hatched on July 3. 

 At hatching the young had a few tufts of long buffy down, and by July 

 17 one of the fledglings had already flown from the nest. 



E. S. Morton (in Iitt. to Eisenmann) reports the White-throated 

 Robin a common breeder on Cerro Campana, western Province of Pan- 

 ama, in April-July in 1970 and 1971. Some nests were in niches formed 

 by epiphytes or on depressions on the trunk of a tree, and were com- 

 posed mainly of moss with a little mud. During most of the dry season 

 the species almost completely disappeared, probably descending to the 

 humid lowlands or dispersing widely in search of fruit. 



TURDUS ALBICOLLIS COIBENSIS Eisenmann 



Turdus assimilis coibensis Eisenmann, 1950, Auk, 67, p. 366. (Coiba Island, 

 Veraguas, Panama.) 



Characters. — Above and below ruddier than cnephosus; undertail 

 coverts with broad fuscous margins; bill largely dark. 



A male taken March 23, 1962, on Isla Brincanco, Islas Contreras, 

 had the iris orange-brown; eye-ring honey yellow; base of bill dull 

 fuscous-black; tip dull greenish yellow shading to honey yellow on 

 distal half of cutting edge; tarsus and toes light buffy brown; claws 

 dull brownish white. 



Measurements. — Males (8 from Isla Coiba and 2 from Isla Brin- 

 canco), wing 109.5-117.5 (112.8), tail 74.8-89.1 (83.1), culmen from 

 base 20.5-22.9 (21.7), tarsus 27.6-31.8 (30.1) mm. 



Females (5 from Isla Coiba and 1 from Isla Rancheria), wing 108.0- 

 1 13.4 ( 1 12.1 ) , tail 79.5-86.8 (82.6) , culmen from base 21.0-23.3 (22.2) , 

 tarsus 29.0-31.0 (30.2) mm. 



Resident. This is the only thrush on Coiba Island and adjacent Isla 

 Rancheria. In January and February 1956 it was the most abundant 

 bird on Coiba in high forest, although unlike the mainland forms, here 

 it also descends to sea level, where I found it in the edge of a mangrove 

 swamp at the Rio Catival. In the Punta Damas section of the island I 

 saw them feeding on berries in trees and searching among the dry 

 leaves on the trail. By squeaking I often drew in a dozen. Their call is 

 a complaining chur-r-r or pru-rr-r, and their song, which I heard on 



