164 
Mr. P. L. Sclater^s Revision of 
depth_, seems to be a constant character_, and is one which I 
have not met with in any stage of C. pectoralis. 
The moulting specimens of C. cinereus, to which I have 
alluded^ show indisputably that the fuliginous colour of the 
body-plumage is retained for more than one suit of feathers; 
but_, on the other hand,, the white bases to the pectoral and 
abdominal feathers of some specimens, and also the white 
mingled with the fuliginous plumage in the wing-linings, 
look very like an approach towards the white-bellied adult 
plumage of C. pectoralis. 
At the risk, I fear, of being too prolix, I have put together 
such facts as I have been able to collect on the curious sub¬ 
ject of the changes incident to C. pectoralis, and of the pos¬ 
sible specific distinction between it and C. cinereus ; and it is 
to be hoped that naturalists in Africa will be able, by further 
observations, to settle the latter question, which must, for 
the present, remain an open one. I would add that it will 
be especially desirable to ascertain whether the fuliginous 
birds always pair between themselves, or whether they some¬ 
times interbreed with those that are white-bellied—also to 
ascertain the first plumage of their young, and whether fuli¬ 
ginous nestlings are ever really produced, as has been asserted, 
from white-bellied parents. 
I must postpone to my next paper the consideration of 
the genus Helotarsus, with which I hope to complete my 
review of the Circaetine group. 
[To be continued.] 
XII.— Revision of the Species of the Cotingine Genus Pipreola. 
By P. L. ScLATER, M.A., Ph.D., F.E.S. 
(Plate VI.) 
In 1849 Lafresnaye* * conceived the idea of separating the 
Green Cotingas, allied to Ampelis viridis, Lafr. et D^Orb., 
into a subgenus, for which he proposed the name Pyrrho- 
* In his commentary on Tschudi’s ^ Fauna Peruana,’ Eev. Zool. 1849, 
p. 103. 
