1918.] the Birds of the Anglo-Egyptian Sudan. 427 



Oriolus galhula Liun. ; Shelley, B. A. v. p. 3 ; Butler, 

 Ibis, 1905, p. 323, 1909, p. 394. 



[B. coll.] 4 Khartoum Sept. Oct. ; 1 Jebel Maba Apl. 

 Sen. 



All iu immature plumage and on migration (see Butler, 

 Ibis, 1905, p. 323). 



Oriolus auratus. 



Oriolus auratus Vieill. ; Shelley, B. A. v. p. 5 ; Butler, 

 Ibis, 1908, p. 221, 1909, p. 79. 



[B. coll.j 2 Iloseires July Aug. Sen. ; 1 Chak Chak 

 Jan., 1 Klior Gitti Jan., 2 Raffali Feb., 1 ur. Kojali 

 Mch. B.G. ; 1 Kajo Kaji Mch. L.E. 

 [Chr. coll.] 5 Mt. Baginzi Mch., 2 Meridi Jan, 3 Wau 



July-Aug. B.G. ; 2 Yei Dec L.E. 

 The Sudan Orioles have been separated under the name 

 of 0. a.chryseus Heugl. on account of their having a shorter 

 bill than the typical West African form. We have measured 

 a series of 14 adults from West Africa and 18 from the 

 Sudan, and find that the difference is negligible, namely 

 28 to 27 mm. 



Oriolus larvatus. 



Oriolus larvatus Licht. ; Shelley, B. A. v. p. 12. 



A form of Black-headed Oriole occurs in the Sudan, 

 namely, Oriolus rolleti (Salvadori, Atti Accad. Torino, vii. 

 1864, p. 151), and was described from the Upper White 

 Nile, where it was obtained by Brun RoUett in 7° N. lat. 



The species is not represented in the Butler collection. 



As there is some doubt about the forms of the Black- 

 headed Oriole, we will not commit ourselves to the sub- 

 specific name. 



Oriolus sp. 



In Major Christy's collection is a large Oriole obtained 

 at Yambio in March 19]6, and sexed ? , which we arc 

 unable to identify. It resembles 0. auratus, but is slightly 

 larger (wing 147, bill 28) ; it also has distinct traces of 

 black on the crown, most of the feathers having black bases 



