132 BIRDS OF THE REPUBLIC OF PANAMA PART 4 



as we ascended in the mountains. It reached its peak of abundance at 

 our highest camp, Cavulla, near the top of Cerro Vie jo at 3000 feet 

 elevation," in subtropical forest. 



I have encountered this thrush in many localities in Chiriqui: on 

 February 26, 1954, I shot 2 males at El Volcan in open forest at the 

 edge of the llano when the woods were completely dry; on March 8, 

 1954, 1 noted several in forest at Palo Santo; on March 27, 1954, 1 took 

 1 at Laguna Grande; the next day I found others singing and calling in 

 the tops of tall trees at 1490 m in Silla de Cerro Pando; several were 

 in heavy woodland on the Quebrada Candela at Sereno on February 

 23, 1955; at San Felix I shot 1 on February 19, 1956; and at Boquete I 

 found several in forest at 1100 m. 



In Code I have collected specimens at El Valle from Rio Anton, 

 from Cerro La India Dormida at 750 m, and from the open forest along 

 the head of Rio Mata Ahogada (480 m), where it was common. 



Arce collected it in Veraguas at Santa Fe (not dated) . 



In the Province of Panama I found a dozen or so on Cerro Campana 

 in a tract of heavy forest where a purple berry was common. They re- 

 mained under heavy cover and responded readily to a squeak. A male 

 collected by Strauch (Bull. Brit. Orn. Club, 1977, p. 64) at Cerro 

 Campana weighed 66.2 g, a female 77.2 g. 



The song of the White-throated Robin is usually described as robin- 

 like and very fine, consisting of rich, powerful phrases mixed with 

 shorter phrases that are high and weak. In Costa Rica, Skutch (Pac. 

 Coast Avif., no. 34, 1960, p. 84-85) has heard them singing from early 

 February until August 20, with a peak of song in early April. There is 

 also another non-robinlike song less commonly heard. Its calls include 

 a peculiar note like the high-pitched croak of a frog, which does not at 

 all suggest a Turdus. 



In Panama, nests and eggs are known from April through July. 

 Blake (Condor, 1956, p. 387) describes a nest collected April 28, 1932, 

 by Monniche at approximately 1620 m on the slopes of Volcan de 

 Chiriqui that was located half a meter above the ground in a large rot- 

 ten stump. The nest was a shallow cup 76.2 mm wide and 38.1 mm 

 deep, loosely constructed of coarse twigs. It contained 3 partly incu- 

 bated eggs "so heavily speckled and blotched with dull reddish-brown 

 as largely to obscure the pale greenish-white ground cover." The 

 eggs measured 31.3x20.6, 30.4x20.6, 31x21 mm. 



Worth (Auk, 1939, p. 307) found a nest along the Rio Gariche, 

 Chiriqui (1200 m) that on June 26, 1937, contained 2 eggs with a 

 ground color "almost white, tinged with a very pale and diluted green. 



