454 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
6ad. #7, lim. &,2ad. 9,2im. 9, Venezuela, Cerro Yapacana, Upper Orinoco, 
March 19—April 23, 1931. 
One of the immature males from the Brazo Casiquiare presents an 
extreme plumage variation—in it the feathers of the upper half or 
more of the abdomen have conspicuous pale buffy to hazel shafts 
edged with hazel to auburn; the other immature birds resemble the 
adults. 
Several of the April birds were noted as being in breeding condition 
when shot. : 
This race occurs along the eastern side of the Rio Negro from 
Mand4os up to southwestern Venezuela, crossing the Casiquiare and 
the Upper Orinoco, and also along the Rio Branco to French and 
Dutch Guiana. 
CRANIOLEUCA GUTTURATA (Lafresnaye and D’Orbigny): D’Orbigny’s Spinetail 
Anabates gutturatus LAFRESNAYE and D’Orsiany, Synopsis avium, pt. 2, in Mag. 
Zool., vol. 8, 1838, cl. 2, p. 14 (Yuracares, Bolivia). 
SPECIMENS COLLECTED 
lad. o&, Venezuela, Raudal Corocoro, Brazo Casiquiare, February 9, 1931. 
lim. 2, Venezuela, Brazo Casiquiare, below mouth of Rio Pacila, February 
11, 1931. 
lad. 2, lim. 9, Venezuela, Upper Orinoco, Cerro Cariche, February 24, 1931. 
Carriker (Proc. Acad. Nat. Sci. Philadelphia, vol. 86, 1934, pp. 
322-323) considered birds from Rioja and Moyobamba, Peru, and from 
Rio Simo, eastern Ecuador, as C. g. peruviana (Cory) and later 
identified the present examples as of this race. Aside from the fact 
that he had no truly topotypical gutturata (he considered south- 
eastern Peruvian examples from Puno as such) and therefore could 
not definitely prove the validity of Cory’s race, it follows that if the 
present birds are also of this form, the name to be applied to them 
would have to be hyposticta (Pelzeln) based on Rio Negro material. 
This name, proposed in 1859 (Sitzungsb. math. nat. K]. Akad. Wiss. 
Wien, vol. 34, pp. 102, 123) has 60 years’ priority over peruviana 
Cory. However, two questions still remain unsettled—first, is 
peruviana distinct from gutturata, and second, if so, are Rio Negro and 
south Venezuelan birds (hyposticta) the same as peruviana or gutturata 
or are they different from both (hyposticta)? 
Four specimens from eastern Ecuador are somewhat less brownish. 
more grayish olive above, than are our birds. Chapman (Bull. Amer. 
Mus. Nat. Hist., vol. 55, 1926, p. 435) found Ecuadorian birds (in- 
cluding two of the four here examined) to be more ‘‘olive above than 
four from Bolivia, but the latter are matched by one from the upper 
Orinoco (Mt. Duida) and another from the lower Orinoco (Caura). 
Pelzeln’s hyposticta was based on a Rio Negro specimen, and until the 
status of the interior form can be determined, it seems unwise to 
