488 PROCEEDINGS OF THE NATIONAL MUSEUM: VOL. 97 
A number of the specimens collected in October, November, and 
February were found to be in breeding condition at the time; some of 
those taken in January, February, and April show signs of molting; 
one obtained in March is in very worn plumage but shows no trace 
of molt. 
Apparently a common bird in the Upper Rio Negro and the Upper 
Orinoco Basins. 
Two additional specimens, taken at Salta do Hud, November 19-21, 
1930, were preserved in alcohol. 
PACHYRAMPHUS RUFUS (Boddaert): Cinereous Becard 
Muscicapa rufa BoppaERT, Table des planches enluminéez ... , 1783, p. 27 
(based on “Le Gobe-mouche roux de Cayenne” Daubenton, Planches 
eplumineés . .., pl. 453, fig. 1: Cayenne.) 
SPECIMENS COLLECTED 
1 ad. o’, Brazil, Mandos, September 26, 1930. 
1 ad. 9, Venezuela, Soledad, Anzodtegui, December 4, 1929. 
The male has an unusually short wing (61.5 mm. as compared with 
65.3-69 in other examples from Cayenne, Panama, Venezuela, and 
Colombia) and also a short tail (44 mm. as compared with 44-51 mm. 
in the other specimens seen). The female, on the other hand, is 
quite large (wing 68.3; tail 50.2 mm.). The male is not in molt and 
seems to have all its feathers. 
PACHYRAMPHUS POLYCHROPTERUS NIGER (Spix): Black-bellied Becard 
Pachyrhynchus niger Sprx, Avium species novae. . . Brasiliam . . ., vol. 2, 1825, 
p. 33, pl. 45, fig. 1 (no locality stated; ‘‘Amazonas, prope Fonteboa’”’ desig- 
nated by Berlepsch and Hartert, Nov. Zool., vol. 9, 1902, p. 56). 
SPECIMEN COLLECTED 
1 ad. 9, Venezuela, Puerto Ayacucho, January 4, 1930. 
Puerto Ayacucho and Mount Duida appear to be about as far 
north in Venezuela as this race occurs, its place being taken in the 
more northern parts of the country by P. p. tristis. Two females of 
the latter race, from El Sombrero, Gudrico, Venezuela, are slightly 
yellower, less washed with olive-green, below than the present ex- 
ample of niger, and have somewhat more tapering bills (seen from 
above), and are slightly smaller (wing shorter). 
This is one of a number of species that has an Orinocoan race and 
an Amazonian race (or even more than one in Amazonia) but where 
the Amazonian-Rio Negro form extends into the upper drainage basin 
of the Orinoco; in other words, where the racial change takes place 
within the Orinocoan Basin, and not between the Orinocoan and the 
Amazonian systems. 
The specimen is in fresh plumage. 
PACHYRAMPHUS MARGINATUS NANUS Bangs and Penard: Dwarf Black-capped Becard 
Pachyrhamphus marginatus nanus Banas and Penarp, Bull. Mus. Comp. Zool., 
vol. 64, 1921, p. 395 (Xeberos, Peruvian Amazon, Peru). 
