1881.] MR. SCLATER ON BIRDS FROM BRITISH GUIANA. 213 



me to say that the supposed Guianan V. chlorogaster {cf. Salvin, 

 /. s. c.) is inseparable from V. leucotis, and that this species therefore 

 ranges from Cayenne and the Rio Negro to the Huallaga. Mr. itn 

 Thurn's specimen is inseparable from skins obtained by Mr. Buckley 

 at Sarayacu, Ecuador. 



2. Cyanicterus venustus, Bp. 



Orthogonys cyanicterus, Scl. P. Z. S. 1856, p. 122. 



Cyanicterus venustus, Bp. Consp. i. p. 2'40 (1850). 



Callithraupis cyanictera, Berl. orn. Centralbl. 1879, p- 63. 



A single female example of this Tanager, obtained on the Maza- 

 runi river by the same collector. 



Mr. im Thurn gives me the following note on this species : — " Two 

 examples of this bird were brought to me at the same time by Pauli ; 

 but one of them, which was evidently a male, was afterwards com- 

 pletely destroyed by ants. When giving them to me, Pauli, who has 

 collected diligently in Guiana for upwards of forty years, told me 

 that he had only once before met with one of these birds, and that 

 was on the same river." 



3. Orchesticus ater. 



Orchesticus ater, Scl. P. Z. S. 1856, p. 67. 



Ta7iaffra olivina, Sc\. P.Z. S. 1864, p. 607, et 1873, p. 186, 

 pi. xxi. (jun.). 



Graf von Berlepsch has convinced me of the fact, which I could at 

 first hardly believe, that my Tanagra olivina (ex Natt. MS.) is 

 merely the young bird of Orchesticus ater. A skin obtained by Mr. 

 im Thurn on the Corentyn river in November 1879 well serves to 

 confirm this excellent identification. The general plumage is green, 

 as in Tanagra olivina, so-called ; but the black colour is beginning 

 to show on the lores, throat, and upper wing-coverts. 



4. Agel^us imthurni, sp. nov. 



Thilius major, Bp. Compt. Rend, xxxvii. p. 833 (1853) ? 



Nigerrimus unicolor, fasciculo plurnarum axillarijluvo ; rostro et 

 pedibus nigris : long, tola 10'4, alee 5'0, caudce rotutidatce 

 rectr. med. 4-8, ext. 3 8, rostri \-2, tarsi 1-2. 



ffab. Guiana Brit, int. (im Thurn). 



Mr. im Thurn's series contains a single example of this fine and 

 well-marked Icterine bird, which is quite new to me. It was obtained 

 by Mr. im Thurn himself at the Kaieteur Waterfall on the Potaro river 

 in November 1 878. Though the generic divisions of the Icteridfe are 

 a little puzzling, I am disposed to place this along wilh the true 

 Agelai, as arranged in the ' Nomenclator,' next to A. thilius, of 

 Chili, from which it may be at once distinguished by its much 

 larger size, by the yellow colour being confined to the tuft of 

 axillary plumes, and by both upper and under wing-coverts being 

 black. 



