326 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



forms of which, such as bolivianus, the bill is actually narrower than 

 in a number of more distantly related species of Basileuterus (e.g., 

 coronatus) . Lowery and Monroe, by including rivularis in Phaeo- 

 thlypis, left the genus with no distinguishing characters. The best way 

 to resolve this inconsistency is by refusing to recognize the validity of 

 Phaeothlypis. 



Figure 25. — Buff-rumped Warbler, Reinita de Rabadilla Anteada, Basileuterus 



fulvicauda. 



In Panama there are two very distinct forms of B. fulvicauda that 

 Todd (op. cit., p. 9) considered to be separate species. One form, 

 semicervina, is found in the eastern half of Panama and in the Western 

 and Central Andes from Colombia to northwestern Peru. Two sub- 

 species have traditionally been recognized within the western half of 

 Panama, leucopygia and veraguensis (with their respective synonyms 

 gaffneyi and toddi) . The stated range of leucopygia is from Honduras 

 through Costa Rica and along the Caribbean slope of Panama to Ver- 

 aguas; that of veraguensis is from southwestern Costa Rica along the 

 Pacific slope of Panama to the Canal Zone. According to Todd (p. 

 12), the only distinguishing feature of veraguensis is the supposedly 

 bufher, less whitish, underparts. A series of 36 specimens from Nica- 

 ragua to the Canal Zone shows individual variation to be too great to 

 permit any subdivision of this population. Three birds (USNM no. 



