432 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



in western Bocas del Toro ; to 1800 meters on Volcan Barii near 

 Cerro Punta and Boquete. 



The larger series of specimens now available allows better under- 

 standing of the races represented in the Republic. The darker sub- 

 species, nigricapillus, of adjacent Costa Rica intergrades along the 

 western boundary with the present form bangsi, with the mixed 

 population represented by birds from the Burica Peninsula, near 

 Sereno in the highlands, and from Almirante in Bocas del Toro, 

 variable in markings but related as a whole to the subspecies bangsi. 

 There is one in the Havemeyer collection in the Peabody Museum 

 at Yale from Sibube on the Rio Sixaola at the Costa Rican boundary. 

 The area concerned is too narrow and the population too varied to 

 warrant inclusion of nigricapillus as a separate entity. Those of the 

 Boquete area, the type locality of bangsi, though assigned by Blake 

 (Fieldiana : Zool., vol. 36, 1958, p. 538) to nigricapillus are recognized 

 here as bangsi. 



In earlier studies, Aldrich (Scient. Publ. Cleveland Mus. Nat. 

 Hist., vol. 7. 1937, pp. 103-104), with limited comparative material, 

 assigned specimens that he had collected on the western side of the 

 Azuero Peninsula to the eastern race brunneiceps. The series now 

 at hand demonstrates that those of eastern Veraguas instead should 

 be placed under bangsi. At the lower end of the Azuero Peninsula 

 in 1957 I collected one, March 13, on the Rio Caldera below Pedasi, 

 and March 18 one (of two seen) on the Rio Oria near Los Asientos, 

 both in southern Los Santos. I did not find this bird in the open 

 country in northern Los Santos and Herrera on the eastern side of 

 the Peninsula, nor in southern Code beyond. 



MYIARCHUS TUBERCULIFER BRUNNEICEPS Lawrence 



Myiarchns brunneiceps Lawrence, Ann. Lye. Nat. Hist. New York, vol. 7, 

 May 27, 1861, p. Z27. (Atlantic slope, Panama Railroad, Lion Hill Station, 

 Canal Zone, Panama.) 



Characters. — Crown sooty brown ; back, scapulars, and rump paler, 

 more greenish olive ; primary edgings paler, bulify white. 



A male, collected at Puerto Obaldia, San Bias, February 16, 1963, 

 had the iris dark brown ; maxilla black ; mandible fuscous-black, 

 tarsus, toes and claws black ; tongue dull orange ; rest of inside of 

 mouth and gape pale greenish yellow. 



Measurements. — Males (10 from Code, Province of Panama, 

 Darien and San Bias), wing 74.3-80.0 (76.7), tail 66.2-73.0 (69.7), 

 culmen from base 19.2-21.6 (20.2), tarsus 19.0-19.6 (19.2) mm. 



