262 BIRDS OF THE REPUBLIC OF PANAMA PART 2 



the Rio Sixaola. Peters (Bull. Mus. Comp. Zool., vol. 71, 1931, p. 

 314) recorded them from Changuinola, Almirante, and Guabo. I 

 secured several around Bahia Almirante in January and February 

 1958, and Handley secured 1 (in formalin) on Cayo Agua. One re- 

 ported by Blake (Fieldiana: Zool., vol. 36, 1958, p. 515) in the 

 Monniche collection from "Cordillera" at "5000 feet," possibly came 

 from lower down on the Holcomb Trail. Farther east on the Carib- 

 bean side in northwestern Code I shot a male at Tigre, elevation 475 

 meters, on the Rio Guabal in the headwaters of the Rio Code del 

 Norte. I secured others on the Rio Uracillo, a tributary of the Rio 

 Indio in northeastern Code, in February 1952. 



Intergradation with the eastern subspecies darienensis is apparent in 

 those secured at El Uracillo. These resemble ventosus on the lower 

 surface, but are deeper green above. 



Skutch (Auk, 1964, pp. 22-23) in observations at El General, Costa 

 Rica, found these hummingbirds at singing posts that they occupied 

 regularly. He writes that the song "was more tuneful and varied 

 than those of most hummingbirds" so much so that when first heard he 

 thought that it must have come from some wood warbler unknown 

 to him. The songs lasted for 4 or 5 seconds and were separated 

 by longer intervals of silence. The singing period in the main came 

 in the first half of the rainy season. 



To the north this race ranges through Costa Rica to Nicaragua, and 

 recently has been found in the Department of Izabal in eastern 

 Guatemala (Land and Kiff, Auk, 1965, p. 286). 



THRENETES RUCKERI DARIENENSIS Bangs and Barbour 



Thrcnctes ruckeri darienensis Bangs and Barbour, Bull. Mus. Comp. Zool., 

 vol. 65, September 1922, p. 204. (Cerro Sapo, Darien, Panama.) 



Characters. — Upper surface shining green ; cinnamon of foreneck 

 less extensive (extending barely to the upper breast) and brighter, 

 more rufous ; gray of breast and abdomen slightly darker ; under tail 

 coverts darker green. Some show a bronzy sheen on the back, but 

 less in amount than in ventosus. 



A male taken February 22, 1961, on the Rio Boqueron, Colon, near 

 the Peluca Hydrographic Station, had the iris dark brown ; side of 

 base of maxilla forward to the nostril, mandible except the tip, and 

 the bare skin between the rami honey yellow ; bottom of the groove 

 anterior to the nostril brownish yellow; rest of maxilla and tip of 

 mandible black ; bare crus, tarsus, and toes dull reddish brown ; claws 

 black. 



