81 



The Brazilian specimens of this bird are slightly larger in size 

 tban those from Cayenne, and of rather a more yellowish green on 

 the back. This species may be distiriguished from all its nearest 

 allies by its black bill. 



2. Arremon d'orbignii, sp. nov. 



Embernagra silens, Lafr. et d'Orb. Syn. Av. in Mag. de Zool. 1837, 

 p. 34 (partim). 



Arremon silens, d'Orb. Voy. p. 281 (^partim). 



Supra olivascens : tania verticali cinerea : superciliis a fronte in- 

 cipientibus cum corpore subtus albis ; koc nigro torquato : rastro 

 flavo ; mandibulce superioris parte culminali nigra, 



Hab. Bolivia, pro v. Yungas (d'Orb.). 



Mus. Parisiensi. 



This Bolivian species comes nearest to A . flavirostris, but there is 

 more black on the upper mandible, and the superciliary stripes begin 

 from the front, as in ^. silens. 



3. Arremon flavirostris. 



Tordo de bosque torgūato, Azara, i. p. 331 ? 



Arremon silens, Hartl. Ind. Az. p. 5 ? 



Arremon flavirostris, Sw. An. in Men. p. 34/ ; Gray, Gen. p. 361 ; 

 Bp. Consp. p. 487. 



Supra olivascens : tania verticali cinerea : superciliis ab oculo in- 

 cipientibus et corpore subtus albis ; hoc nigro torguato : lateribus 

 cinerascentibus : rostro flavo : ipso culmine tantum nigro. 



Hab. Brazil, Cameta {Mus. BeroL). 



Mus. Berol., Derbiano. 



4. Arremon devillii, sp. nov. 



Arremon devillii, Bp. in Mus. Paris. 



A. schistaceus, olivaceo paululum tinctus : tania verticali dorso con- 

 colore : superciliis ab oculo incipientibus et corpore subtus albis, 

 hoc nigro torguato : tectricibus alarum superioribus olirJaceis : 

 rostro superiore nigro, inferiore flavo. 

 Long. totą 6'0, alse 2-2, caudse 2'1. 

 Hab. prov. Goyaz in Brazil (Cast. et Dev.). 

 Mus. Parisiensi. 



This bird is intermediate hetween A. flavirostris and A. polionotus. 

 Unlike the latter, it has the whole upper mandible black and the 

 back tinged with olive, and is besides of smaller size, and possesses 

 a vertical band. From the former it appears distinguishable by its 

 differently coloured bill and less olivaceous back. 



5. Arremon polionotus. 



Arremon polionotus, Bp. Consp. p. 488 



Supra plumbeus : capite et torgue angusta pectorali nigris : super- 

 ciliis postocularibus et corpore subtus albis ; lateribus cinerascen- 



No. CCCVI. — Proceedings of the Zoological Society. 



