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 ciirious 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.R.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,' Rev. Zool. 1849, 

 p. 103. 



