148 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 



La Union and Nicare on the Caura River. The Brooklyn Museum 

 specimens from Las Barrancas (Orinoco Delta region) are referred 

 to this form but are somewhat intermediate in character between 

 albipectus albipectus and albipectus hypoleiicus. 



Thryophilus albipectus hypoleucus Berlepsch & Hartert. 



ThryophUus albipectus hypoleucus Berlp. & Hart., Bull. B. O. C. XIL 



1901. p. 12; Novit. Zool. IX. 1902. 6. 



This, the lightest colored form of the white-breasted wren, is 

 found everywhere along the Orinoco from Ciudad Bolivar up as far 

 as, possibly beyond, the mouth of the Meta River. It, in common 

 with the other races of this species, frequents the denser clumps of 

 trees and bushes that dot the edges of savanna regions. 



Fresh birds have the eye mummy brown ; bill blackish above, slate 

 color below ; feet plumbeous. 



Specimens were collected at Agua Salada de Ciudad Bolivar, 

 Ciudad Bolivar, Altagracia, Caicara and Ouiribana de Caicara. The 

 specimens collected by the writer at Agua Salada de Ciudad Bolivar 

 and at Ciudad Bolivar are somewhat intermediate in character, form- 

 ing with the Las Barrancas specimens of albipectus albipectus links in 

 the evidence pointing to the common origin of the two forms. 



Thryophilus albipectus bogotensis Hellmayr. 



Thryophilus albipectus bogotensis Hellmayr, Verhandl. Zool.-Botan. 



Gesellsch. Wien, LI. 1901. p. 774. (Type in Berlepsch Museum, 



Bogota Coll.). 

 Thryophilus albipectus subsp. Berlepsch & Hartert, p. 6. 



This dark race was observed and collected by the writer on the 

 Upper Orinoco at Perico, Maipures, Munduapo and Nericagua. In 

 the American Museum collection there are specimens from La Union 

 (on the Caura River) and from the Mato River collected by S. M. 

 Klages, and two examples from Surinam (Chunkoo Coll.) that, by 

 comparison with specimens collected by the writer at Maipures and 

 Nericagua on the Upper Orinoco, seem to be typical of this race. 



In a female from Nericagua there are faint traces of narrow dusky 

 bars on the back. In the female from Surinam such bars are quite 

 evident and they are indicated in both a male and female example 

 from La Union. 



