BIRDS FROM BRAZIL AND SOUTHERN VENEZUELA—FRIEDMANN 393 
The present specimens do not agree with the description of C. ec. 
barnesi or with topotypical specimens of that race; they are very much 
paler in coloration. 
ODONTOPHORUS GUJANENSIS MEDIUS Chapman: Duida Partridge 
Odontophorus gujanensis medius CHAPMAN, Amer. Mus. Nov., No. 380, 1929, p. 3 
(Cafio Secco, Mount Duida, Venezuela). 
SPECIMENS COLLECTED 
2 ad. o, Venezuela, Cerro Yapacana, Upper Orinoco, March 24—April 1, 1931. 
This form of this wide-ranging partridge has the throat and sides of 
the head grayish as in buckley: but has the underparts ochraceous- 
tawny as in gujanensis. Hellmayr and Conover (Catalogue of birds 
of the Americas, pt. 1, No. 1, 1942, p. 264, footnote) refer specimens 
from the uppermost stretches of the Rio Negro (Cocuy) near the 
Venezuelan boundary, to this race. In other words, here as in so 
many other species, the birds of the Upper Rio Negro and of the Upper 
Orinoco are alike. The race ranges from southern Venezuela (Caura 
and Upper Orinoco Valleys and Mount Duida) to the adjacent parts 
of extreme northwestern Brazil (Upper Rio Negro and Rio Uaupés). 
The male is somewhat paler than the female. Both birds are in 
fairly fresh plumage. 
Family OPISTHOCOMIDAE: Hoatzins 
OPISTHOCOMUS HOAZIN (P. L. S. Miiller): Hoatzin 
Phasianus hoazin P. L. 8S. Mittuumr, Natursystem, Suppl., 1776, p. 125 (based on 
“Faisan huppé de Cayenne’’; Cayenne). 
SPECIMEN COLLECTED 
1 ad. o', Venezuela, Raudal Corocoro, Brazo Casiquiare, February 7, 1931. 
The single specimen of this peculiar bird obtained is in fine, fresh 
plumage. 
Family ARAMIDAE: Limpkins 
ARAMUS GUARAUNA GUARAUNA (Linnaeus): Southern Limpkir 
Scolopaz guarauna LINNAEUS, Systema naturae, ed. 12, vol. 1, 1766, p. 242 
(based on “Le Courly brun d’Amerique”’ Brisson, Ornithologia . . ., vol. 5, 
p. 330, and “Guarauna’”’ Marcgrave, Historiae rerum naturalium Brasiliae 
libri octo, p. 204; “in America australi’’; type from Cayenne). 
SPECIMENS COLLECTED 
1 ad. o, Venezuela, Brazo Casiquiare, Viudita, February 13, 1931. 
lad. 9, Venezuela, Brazo Casiquiare, Piedra Pintada, February 14, 1931. 
The female has more white along the midventral line than the male. 
Both birds are in good but slightly worn plumage. 
The southern limpkin is widely distributed over tropical South 
America from Panama to northern Argentina. If Vieillot’s form 
A, g. carau be recognized, the southern limit of the nominate race 
