l68 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



Central America, and in Colombia south along the Pacific Coast to 

 western Ecuador, and east to the Magdalena Valley. The population 

 of the coastal area from north-central Choco (Nuqui) in western 

 Colombia south to Ecuador is easily distinct in darker, more olive hue 

 in the male, and darker brown in the female. The others when viewed 

 in series may be separated into two groups on only slight average 

 difference in depth of color. The following summary is based on the 

 series of 71 males and 50 females now available in the U.S. National 

 Museum, with additional material seen in other museums. In making 

 comparisons it should be remembered that older specimens, even 

 when stored carefully in museum cases, may have changed in color 

 to become appreciably darker when compared with recently collected 

 material. 



Myrmotherula fulvivenfris fulviventris (Lawrence). 



Myrmetherula [sic] fulviventris Lawrence, Ann. Lye. Nat. Hist. New York, vol. 



7, 1862, p. 468. (Line of Panama Railroad, Atlantic Slope, Canal Zone, 



Panama. ) 

 Myrmotherula fulviventris costaricensis Todd, Proc. Biol. Soc. Washington, 



vol. 40, December 2, 1947, p. 156 (El Hogar, Costa Rica.) 



Averaging slightly darker above and below in both sexes. 



Caribbean slope from eastern Honduras through eastern Nica- 

 ragua, eastern Costa Rica and northern Panama to the Canal Zone, 

 Panama. 



The birds of Panama from the Canal Zone westward are not 

 separable from those of Costa Rica. 



Myrmotherula fulviventris salmoni (Chubb) 



Rhopias fulviventris salmoni Chubb, Ann. Mag. Nat. Hist., ser. 9, vol. 2, July 

 1918, p. 124. (Remedies, Antioquia, Colombia.) 



Slightly paler above and below in both male and female. 



Eastern Panama from the eastern sector of the Province of 

 Panama through Darien, and through San Bias ; continuing in Co- 

 lombia from the western side of the lower Rio Atrato in extreme 

 northern Choco (Ungia, Acandi) through northern Antioquia (Villa 

 Artiaga, Botero) and Department of Cordoba, east in the upper Rio 

 Cauca Valley, and through Bolivar and northern Santander in the 

 Magdalena Valley. 



Birds from extreme western San Bias and Chepo in Panama are 

 somewhat intermediate toward the subspecies fulviventris. 



