BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 469 
Immature females are more orange-ochraceous on the chin, throat, 
and breast than are adults of the same sex. Immature males are like 
the young females but somewhat duskier, washed with olive rather 
than with orange on their ochraceous throats and breasts. 
MYRMOTHERULA MENETRIESI PALLIDA Berlepsch and Hartert: Western Gray-throated 
Ant-wren 
Myrmotherula cinereiventris pallida BERLEPSCH and Harrert, Nov. Zool., vol. 9, 
1902, p. 74, pt. (Nericagua, Rio Orinoco, Venezuela). 
SPECIMENS COLLECTED 
2im. 9, Brazil, Cucuhy, Rio Negro, February 1-8, 1930. 
lad. o, Brazil, Santa Isabel, Rio Negro, October 17, 1930. 
lad. 2, Brazil, Rio Negro, mouth of Rio Cauabury, October 22, 1930. 
1 ad. o’, Brazil, Panela de Onca, Rio Cauabury, November 1, 1930. 
lad. o, 1 ad. 2, Brazil, Sio Gabriel, Rio Negro, December 31, 1930-January 
1, 1931. 
lad. 1, 2im. o, 1 ad.- (=), lim. 9, Brazil, Salto do Hud, Rio Maturacé, 
November 14-23, 1930. 
1 ad. 9, Brazil, Serra Imeri, near Salto do Hud, Rio Maturacé, December 4, 
1930. 
lad. o', 1 ad. 9, Venezuela, San Carlos, Rio Negro, January 28, 1931. 
lad. 9, Venezuela, Brazo Casiquiare, Chapazoa, January 30, 1931. 
1 ad. 9, Venezuela, Brazo Casiquiare, below mouth of Rio Pacila, February 
12, 1931. 
1 ad. 9, Venezuela, Brazo Casiquiare, near Cafio Durutomoni, February 19, 
1931. 
lad. #, lad. 2, Venezuela, Brazo Casiquiare, near Caio Mabinagui, February 
20, 19381. 
1 ad. co’, lad. 2, Venezuela, Upper Orinoco, near Cerro Cariche, February 24 
1931. 
3 ad. o', lim. 9, Venezuela, Cerro Yapacana, Upper Orinoco, April 21-25, 1931, 
Birds in breeding condition were taken in April; specimens in molt 
in February. 
This is another of the many forest birds that range unchanged from 
the Rio Negro to the Upper Orinoco. 
A specimen, preserved in alcohol, was taken at Salto do Hua, 
November 20, 1930. It is an addition to the skins listed above. 
HERPSILOCHMUS DORSIMACULATUS Pelzeln: Spotted-backed Antbird 
Herpsilochmus dorsimaculatus PELZELN, Zur Ornithologie Brasiliens .. ., pt. 2, 
1868, p. 60, 150 (Marabitanas, Upper Rio Negro). 
SPECIMENS COLLECTED 
lim. ?, Brazil, Serra Imeri, near Salto do Hud, November 29, 1930. 
lim. 9, Venezuela, Brazo Casiquiare, Chapazon, January 31, 1931. 
1 ad. o, Venezuela, Brazo Casiquiare, near Caiio Mabinagui, February 20, 1931. 
The spotted-backed antbird is one of the very few full species 
known only from the upper Rio Negro and the adjacent portions of 
southern Venezuela (Upper Orinoco and Upper Caura Rivers). 
760001—_48——_7 
