470 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 91 
FORMICIVORA GRISEA GRISEA (Boddaert): Guiana Antbird 
Turdus grieseus BoDDAERT, Table des planches enluminéez . . ., 1783, p. 39 (based 
in ‘‘Le Grisin, de Cayenne”? Daubenton, Planches enluminées . . ., pl. 643, 
fig. 1: Cayenne). 
SPECIMEN COLLECTED 
1 ad. 9, Brazil, Mandos, September 30, 1930. 
It seems strange that but a single example of this“ antbird ‘was 
obtained on the Rio Negro and so considerable a series of ‘the next 
two forms in the Venezuelan territory farther north. 
FORMICIVORA GRISEA RUFIVENTRIS Carriker: Carriker’s Antbird 
Formicivora grisea rufiventris CARRIKER, Auk, 1936, p. 316 (Cerro Yapacana, 
Upper Orinoco River, Venezuela). 
SPECIMENS COLLECTED 
1 ad. o&, 1 ad. 9, Venezuela, Upper Orinoco, right bank opposite Corocoro 
Island, March 12, 1931. 
6 ad. o', lim. o&, 8 ad. 9, lim. —-, Venezuela, Cerro Yapacana, Upper Orinoco, 
March 12—April 27, 1931. 
This is the original series on which Carriker’s studies leading 
to his description of the form were based. As he says, the male is 
very similar to that of F. g. grisea of the Guianas but averages slightly 
darker brown above and with shorter wings (52-54 mm. as against 
57-59 mm.), but the female is much more richly colored, the under- 
parts being rich rufescent or cinnamon-ochraceous instead of pale 
ochraceous, the upperparts more rufescent, the supraloral and super- 
ciliary streaks cinnamon-ochraceous instead of white, the wing 
coverts almost entirely black, only the inner greater series being 
slightly shaded with chocolate-brown, with the white tips more 
pronounced throughout. 
A number of the birds were noted by the collectors as being in 
breeding condition. 
The immature male resembles the female in plumage but is slightly 
paler ochraceous below, and is acquiring the black adult feathers 
on the chin, throat, and breast, and, to a lesser extent, on the abdomen. 
FORMICIVORA INTERMEDIA ORENOCENSIS Hellmayr: Orinoco Antbird 
Formicivora orenocensis HELLMAYR, Bull. Brit. Orn. Club, vol. 14, 1904, p. 54 
(Altagracia, Rio Orinoco, Venezuela). 
SPECIMENS COLLECTED 
3 ad. #, lim. 0, 2ad. 9, 1-, Venezuela, Puerto Ayacucho, Upper Orinoco, 
January 3, 1930, and May 9-18, 1931. 
2ad. o&, lad. 9, Venezuela, Ciudad Bolivar, June 8-11, 1931. 
lim. ?, Venezuela, Soledad, Anzodtegui, November 29, 1929. 
1 ad. o, Venezuela, Laguna Icacal, Estado Bolfvar, December 8, 1929. 
Some of the May birds were noted as being in breeding condition 
when collected. 
