472 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
The material available for comparison indicates that the dorsal 
coloration of this race is not particularly different from that of R. m. 
trinitatis, but that the present race may be identified by its more 
deeply ochraceous sides and flanks. 
MICROBATES COLLARIS COLLARIS (Pelzeln): Collared Ant-wren 
Rhamphocaenus collaris PELZELN, Zur Ornithologie Brasiliens, pt. 2, 1868, pp. 84, 
157 (Barra do Rio Negro= Mandos). 
SPECIMENS COLLECTED 
1 ad. o&, 1 im. o, Brazil, Salto do Hud, Rio Maturacdé, Venezuelan border, 
November 17-23, 1930. 
lad. co, lad. 9, Brazil, Serra Imeri, near Salto do Hud, December 4-5, 1930. 
The immature male is brighter, more rufescent above than the 
adults. 
CERCOMACRA CINERASCENS CINERASCENS (Sclater): Gray Antbird 
Formicivora cinerascens ScLATER, Proc. Zool. Soc. London, vol. 25, 1857, p. 131 
(Rs Napo, eastern Ecuador). 
SPECIMENS COLLECTED 
lir a, Brazil, Barcellos, Rio Negro, October 6, 1930. 
lin. o&, Brazil, Santa Isabel, Rio Negro, October 16, 1930. 
1 ad. 2, Brazil, Rio Negro at mouth of Rio Cauabury, October 22, 1930. 
The females have the lower back much more grayish, less brownish 
than the mantle. Zimmer (Amer. Mus. Nov., No. 558, 1932, p. 21) 
noted the same in his birds from the Upper Rio Negro and the Upper 
Orinoco, but writes that most of them are not distinguishable from 
Ecuadorian examples. 
CERCOMACRA TYRANNINA TYRANNINA (Sclater): Tyrannine Antbird 
Pyriglena tyrannina ScuatER, Proc. Zool. Soc. London, vol. 23, 1855, p. 90, pl. 98 
(‘“Bogotd4,”’ eastern Colombia). 
SPECIMENS COLLECTED 
2 ad. @, Brazil, Sido Gabriel, Rio Negro, January 14-16, 1931. 
There is a possibility that more extensive material from the area 
may indicate that the Upper Rio Negro is inhabited by an unnamed 
race of this antbird. Hellmayr (Catalogue of the birds of the Ameri- 
cas, vol. 3, 1924, p. 218, footnote) writes that “three birds from Mara- 
bitanas, Rio Negro, . . . appear to belong to tyrannina, although 
the female has the underparts nearly as deep ochraceous tawny as 
crepera ...”’ That is true of the present examples as well. 
CERCOMACRA NIGRICANS Sclater: Black Tyrannine Antbird 
Cercomacra nigricans ScuaTER, Proc. Zool. Soc. London, vol, 26, 1858, p. 245, 
(Santa Marta). 
SPECIMEN COLLECTED 
lad. 2, Venezuela, Soledad, Anzodtegui, December 10, 1929. 
