460 PROCEEDINGS OF THE NATIONAL MUSEUM ~ vou. 97 
Another specimen, taken in Estado Bolivar, December 30, 1929, 
was preserved in alcohol. 
SAKESPHORUS CANADENSIS LORETOYACUENSIS (Bartlett): Bartlett’s Crested Ant-shrike 
Thamnophilus loretoyacuensis BARTLETT, Proc. Zool. Soc. London, 1882, p. 374 
(Loretoyacu, Rio Marafion, northeast Peru). 
SPECIMENS COLLECTED 
lad. 9, Brazil, Providencia, Rio Negro, October 7, 1930. 
2 ad. @, Brazil, Santa Isabel, Rio Negro, October 13, 1930. 
This species is one of the few in which the birds of the Rio Negro 
are racially distinct from those of the Casiquiare and the Upper 
Orinoco. 
The Santa Isabel bird, while not wholly typical, seems best placed 
with this race. Its back is dark brown with rather indistinct shaft 
streaks of black. The tibia are black and the sides and flanks very 
dark gray; the lower breast has a line of black but this does not extend 
on to the abdomen; the under tail coverts are white with dark gray 
bases. The bird appears to be somewhat intermediate toward 
fumosus. 
SAKESPHORUS CANADENSIS FUMOSUS Zimmer: Zimmer’s Crested Ant-shrike 
Sakesphorus canadensis fumosus Zimmer, Amer. Mus. Nov., No. 668, 1933, p. 10 
(Lalaja, Rio Orinoco, Venezuela, altitude 325 feet). 
SPECIMENS COLLECTED 
2 ad. of, lad. ?, Venezuela, Brazo Casiquiare, Playa de Candela, February 8, 
1931. 
1 ad. ?, Venezuela, Brazo Casiquiare, below mouth of Rio Pacila, February 
10, 1931. 
1 ad. @, Venezuela, Upper Orinoco, San Antonio, March 5, 1931. 
1 ad. @, 1 ad. 9, Venezuela, Upper Orinoco, right bank opposite Corocoro 
Island, March 13, 1931. 
8 ad. #, 8 ad. 9, 1 ad. “” (=), Venezuela, Puerto Ayacucho, Rio 
Orinoco, May 8-20, 1931. 
The examples from the Casiquiare and from San Antonio are 
typical fumosus; the others from farther north are intermediate in 
their characters between fumosus, intermedius, and pulchellus. Zimmer 
(Amer. Mus. Nov., No. 668, 1933, p. 16) records a similar state of 
intermediacy for his material from the same area. 
This is one of the rather few cases in which the subspecies inhabiting 
the Rio Negro (loretoyacuensis) is different from the one of the 
Casiquiare and the Upper Orinoco. 
THAMNOPHILUS DOLIATUS FRATERCULUS Berlepsch and Hartert: Venezuelan White- 
barred Ant-shrike 
Thamnophilus doliatus fraterculus BrrLerscH and Hartert, Nov. Zool., vol. 9, 
1902, p. 70 (Altagracia, Venezuela), 
