530 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
thereby extended farther to the southeast in Venezuela and in the 
Upper Rio Negro area of Brazil. Only af ew years ago Griscom and 
Greenway (Bull. Mus. Comp. Zool., vol. 88, 1941, p. 302) added the 
species (nominate form) to the avifaunal list of Brazil; Pinto (Catalogo 
Aves do Brazil, pt. 2, 1944, p. 350) added the race albigularis; now we 
may add caurensis as well. 
The female from Cerro Yapacana was in breeding condition. 
Family MIMIDAE: Mockingbirds and Thrashers 
MIMUS GILVUS MELANOPTERUS Lawrence: Black-winged Mockingbird 
Mimus melanopterus LAwRENCE, Ann. Lyc. Nat. Hist. New York, vol. 5, No. 1, 
1849, p. 35, pl. 2 (Venezuela). 
SPECIMENS COLLECTED 
1 ad. o, Venezuela, Soledad, December 10, 1929. 
2 im. —-, Venezuela, Puerto Ayacucho, Rfo Orinoco, May 21, 1931. 
Though these specimens appear to fall into the concept expressed 
by the use of the name melanopterus, the race may be in need of further 
study. The lone adult is definitely less pure grayish, more brownish 
gray on the upper parts than are adults of comparable sex and season 
from El Sombrero, and Ocumare de la Costa, northern Venezuela. 
It differs from them also in having a somewhat smalier bili although 
its shows no other mensural differences. On the other hand, it is 
slightly less brownish above than adults from Aragua, northern 
Venezuela, which are also considered melanopterus. 
The immature birds are badly abraded but show no evidence of 
postjuvenal molt. 
DONACOBIUS ATRICAPILLUS ATRICAPILLUS (Linnaeus); Black-capped Mocking Thrush 
Turdus atricapillus LINNAEUS, Systema naturae, ed. 12, vol. 1, 1766, p. 295 
(eastern Brazil). 
SPECIMENS COLLECTED 
2ad. #,1lim. 3, Brazil, Ceo de Arary, above Parintins, Amazonas, September 
20, 1930. 
These three specimens have been compared with a long series from 
most parts of the range of this form as well as with examples of the 
other two races of the species. 
The immature specimen has the top of the head and nape dark 
brown instead of black as in the adults and also has white super- 
ciliaries. 
Family TURDIDAE: Thrushes 
TURDUS ALBICOLLIS PHAEOPYGUS Cabanis: Gray-rumped Thrush 
Turdus phaeopygus CaBANis, in Schomburgk, Reisen in Britisch-Guiana . . ., pt. 
3, 1848 (=1849), p. 666 (British Guiana). 
