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 
albipcctus albipcctus and albipcctus liypolcticits. 
TiiRYOPiiiLUS ALBIPECTUS HYPOLEucus Berlepsch & Hartert. 
Thryophilus albipcctus 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 Ijrown ; 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 albipcctus albipcctus links in 
the evidence pointing to the common origin of the two forms. 
Thryophilus albipectus bogotensis Hellmayr. 
Thryophilus albipcctus bogotcnsis Hellmayr, Verhandl. Zool.-Botan. 
Gesellsch. \\'ien, LL 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 Suiinam such bars are quite 
evident and they are indicated in both a male and female example 
from La Union. 
