980 MESSRS. SCLATER AND SALVIN ON AMAZONIAN BIRDS. [DeC. 12, 



Obs. AiRiiis O. crassirostri, sed rostro multo minus crasso ; crissi 

 plumis intus non albo notatis et speculo alari latiore. 



43. Percnostola fortis, sp. nov. (PI. XLV.) 



Nigricanti-cinerea, fere unicolor, pileo suhcristato et corpore 

 subtus ad medium pectus nigris : campterio alari albo : long, 

 tota 7-3, alcB 3-3, caudce 2-7, tarsi 1'4, rostri a rictu 1-15. 

 2 . Obscure cinerea, pileo alis et cuuda extus ferrugineis, dor so 

 et hypochondriis fulvescentibus : campterio albicante. 



Hub. in Peruvia orient. Pebas {Hauxwell) ; Chyavetas (BartL). 



Obs. Forma et habitu P.funebri affinis, sed differt statura majore 

 et alis extus immaculatis. 



Percnostola fortia. 



Two skins, those of an adult male and young male, of this species 

 are in the collection, and have enabled us to make out the female of 

 this species which was in Bartlett's last collection, and which we 

 were previously unable to determine. The form is more nearly that 

 of Percnostola funebris than any other bird of the group with which 

 we are acquainted, but it is larger and stronger. The wings are short 

 and rounded, the fourth, fifth, sixth, seventh, and eighth primaries 

 being nearly equal, and forming the wing-end. The tarsi are not quite 

 so strong as in typical Thamnophili, and are proportionally longer. 



