544 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 97 
occiput black as in eastern birds. There may be a tendency, not yet 
carried to constancy, for a geographic difference. It would take 
more extensive material than I have seen to persuade me to attempt 
to divide ‘‘typical” pelzelni into two races. Furthermore, it may be 
noted that Hellmayr (Nov. Zool., vol. 13, 1906, p. 355) writes that 
specimens from the Caura River, Venezuela, agree with the type from 
the Upper Rio Madeira, which he considers the same as more eastern 
birds (except, of course, for the birds from the Paré district). If 
there were to be considered more urgently the possibility of a western 
split from pelzelni, the facts, as understood at present, would imply 
a range for which it would be difficult to conjure up ecological reasons. 
Family ICTERIDAE: Blackbirds, Hangnests, etc. 
GYMNOSTINOPS YURACARES YURACARES (Lalfresnaye and d’Orbigny): Olive Oropendola 
Cassicus yuracares LAFRESNAYE and D’ORBIGNY, Synopsis avium, pt. 2, in Mag. 
Zool., vol. 8, 1838, cl. 2, p. 2 (Yuracares, Bolivia). 
SPECIMENS COLLECTED 
1 ad. unsexed, Brazo Casiquiare, near Cafio Perro de Agua, Venezuela, Febru- 
ary 18, 1931. 
1 ad. &, Buenos Aires, Brazo Casiquiare, Venezeula, February 21, 1931. 
1 ad. o&, San Antonio, Upper Orinoco, Venezuela, March 3, 1931. 
1 ad. 9, San Antonio, Upper Orinoco, Venezuela, March 9, 1931. 
These birds agree with two specimens from Peru and Colombia. 
The present specimens would be referable to G. y. caurensis Todd if 
that race were valid. However, the series bears out Hellmayr (Cata- 
logue of the birds of the Americas, pt. 10, 1937, p. 9), who considers 
caurensis a synonym of yuracares although stating that “Venezuelan 
birds may have on average slightly weaker bills.”” The only differ- 
ence I can see is that the remiges are darker, more chaetura-black in 
the Venezuelan and Colombian birds, paler, more clove brown in the 
Peruvian example. No topotypical Bolivian birds have been seen. 
The birds listed above are in slightly worn plumage. 
OSTINOPS VIRIDIS (P. L.S. Muller): Green Oropendola 
Oriolus viridis P. L. S. MtuuEr, Natursystem, Suppl., 1776, p. 87 (based on 
‘‘Cassique vert, de Cayenne”? Daubenton, Planches enluminées . . ., pl. 328: 
Cayenne). 
SPECIMENS COLLECTED 
1 #,3 2 ad., SAo Gabriel, Rio Negro, Amazonas, Brazil, January 12-19, 1931. 
1 @ ad., 2 2 im., Cerro Yapacana, Upper Orinoco, Venezuela, April 27, 1931. 
The male, although labeled as an adult, is probably an immature 
bird as it has a very small bill (culmen from base 59 mm. as against 
71 mm. in an adult male from British Guiana) and has the throat, 
breast, and upper abdomen duller, more grayish, less yellowish green 
than in an adult from British Guiana, and has the thighs olive-green 
