BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 511 
The two Brazilian examples (actually taken very close to the 
Brazilian-Venezuelan boundary) are slightly darker than the Cerro 
Yapacana birds, and may be intermediate between cherrei and 
insignis. 
TOLMOMYIAS SULPHURESCENS INSIGNIS Zimmer: Zimmer’s Flatbill 
Tolmomyias sulphurescens insignis ZimMER, Amer. Mus. Nov., No. 1045, 1939, 
p. 5 (Rosarinho, Rio Madeira (left bank), Brazil). 
SPECIMEN COLLECTED 
1 -—, Brazil, near Muirapinima, Rio Negro, October 4, 1930. 
Zimmer records (cit. supra, p. 18) six specimens of this species 
from Muirapinima, as 7. s. insignis. The characters by which this 
race may be distinguished from cherrei are stated to be the “very 
much duller wing-markings, . . . the wing bars and the margins of 
the tertials greenish instead of yellowish, hardly brighter than the 
external margins of the primaries...’ The present specimen, 
judged by these criteria, is not a very typical example of its race but 
is, as one might expect on geographic grounds, somewhat intermediate 
between it and cherrei, but nearer insignis. 
TOLMOMYIAS POLIOCEPHALUS POLIOCEPHALUS (Taczanowski): Gray-crowned Flat bill 
Rhynchocyclus poliocephalus TaczANowskI, Ornithologie de Pérou, vol. 2, 1884, p. 
285 (Nauta, Peru). 
SPECIMENS COLLECTED 
lad. 9, Brazil, Sio Gabriel, Rio Negro, January 16, 1931. 
lad. o, Venezuela, Tamatama, Upper Orinoco, February 238, 1931. 
lim. 9, Venezuela, San Antonio, Upper Orinoco, March 9, 1931. 
The male was in breeding condition. Itis slightly smaller and duller 
in color than the female. 
Zimmer (Amer. Mus. Nov., No. 1045, 1939, p. 14) has found that 
the birds from the Upper Rio Negyro, and the Casiquiare and Upper 
Orinoco are typical poliocephalus and not sclateri of Mandéos and 
eastward. The present material bears this out. 
TOLMOMYIAS POLIOCEPHALUS SCLATERI (Hellmayr): Sclater’s Flat bill 
Rhynchocyclus poliocephalus sclateri HELLMAyYR, Verh. zool.-bot. Ges. Wien, vol. 
53, 1903, p. 207 (Barra do Rio Negro= Mandos, Brazil). 
SPECIMENS COLLECTED 
lad. #7, 3im. @, 1 ad. 9, Brazil, Mandos, September 30—October 1, 1930. 
All five specimens are in somewhat abraded plumage. This race is 
generally duller in coloration and has a more whitish throat than the 
nominate form. 
TOLMOMYIAS FLAVIVENTRIS COLLINGWOODI (Chubb): Northern Yellow-vented Flatbill 
Rhynchocyclus flaviventris collingwoodi Cuuss, Bull. Brit. Orn. Club, vol. 40, 
1920, p. 109 (Macqueripe Valley, Trinidad). 
