468 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 97 
lad. #, Colombian bank of Rio Negro, opposite San Carlos, January 29, 1931. 
1 ad. 3, Venezuela, Brazo Casiquiare, Cerro Guanari, February 4, 1931. 
1 ad. @, 1 ad. 9, Venezuela, Brazo Casiquiare, Raudal Corocoro, Febru- 
ary 7-9, 1931. s 
2ad. @, 2 ad. 9, Venezuela, Brazo Casiquiare, below mouth of Rio Pacila, 
February 10-12, 1931. 
lad. 9, Venezuela, Brazo Casiquiare, below Cafio Caripo, February 22, 1931. 
1 ad. &, 1 ad. 9, Venezuela, Upper Orinoco, near Isla Temblador, Febru- 
ary 25, 1931. 
2ad of, 2im. @, 2ad. 9, 2 im. 9, Venezuela, Upper Orinoco, right bank 
opposite Corocoro Island, March 13-16, 1931. 
Sad. J, 2im. @,4ad. 9 im. 2 9, Venezuela, Upper Orinoco, Cerro Yapacana, 
March 23—April 22, 1931. 
4ad. #7, lad. 9, Venezuela, Rfo Orinoco, Puerto Ayacucho, January 2-4, 1930, 
and May 14, 1931. 
Some of the birds taken in March and April were in breeding con- 
dition; molting specimens were collected in November. 
This subspecies occurs from eastern Peru and eastern Ecuador, to 
eastern Colombia, southwestern Venezuela (the upper Orinoco and 
the Casiquiare), and to the Upper Rio Negro and its tributaries as 
far east as Santa Isabel. According to Zimmer’s findings (Amer. 
Mus. Nov., No. 524, 1932, p. 6) the nominate race occurs on both 
banks of the Rio Negro east of the Rio Branco. We have here 
another instance of a river, such as the Branco, apparently demar- 
cating the ranges of two geographically contiguous races, while the 
watershed between the Negro and the Orinoco systems appears to 
have no such effect. 
A specimen preserved in alcohol was collected at Puerto Ayacucho, 
January 3, 1930, in addition to the skins listed above. 
MYRMOTHERULA LONGIPENNIS LONGIPENNIS Pelzeln: Long-winged Ant-wren 
Myrmotherula longipennis PELZELN, Zur Ornithologie Brasiliens . . ., pt. 2, 1868, 
p. 82, 153 (Rio Negro, Marabitanas). 
SPECIMENS COLLECTED 
lim. #, lim. 2, Brazil, Cucuhy, Rio Negro, February 2-5, 1930. 
lad. 9 (=<), Brazil, Rio Cauabury, below Cachoeira, October 28, 1930. 
1 ad. &, Brazil, Rio Cauabury, Cachoeira Manajé, October 30, 1930. 
lad. #, lim. @, 2 ad. 9, Brazil, Rio Cauabury, November 4-6, 1930. 
3 ad. o, 3im. #, 1 ad. 9, Brazil, Salto do Hud, Rio Maturacd, November 
17-23, 1930. 
5 ad. o#, 2ad. 9, lim. 9, Brazil, Serra Imeri, near Salto do Hud, November 
27—December 4, 1930. 
1 ad. &, Colombian bank of Rio Negro, opposite San Carlos, January 29, 1931. 
lad. 9, Venezuela, San Carlos, Rio Negro, January 28, 1931. 
Birds noted as being in breeding condition were collected in October 
and November; birds showing signs of molt were taken in November 
and January. 
