igiS.] the Birds of the Anglo-Egyptian Sudan. 709 



marked off breast-baud of the females, and we have uo 

 evidence that it has ever occurred in the Sudan. 



Three races of B. bella converge in the Sudan — B. b. 

 chadensis Alex, from Lake Chad, B. b. nyanzoi Neum. from 

 Uganda, and ^. b. erlangeri Neum, from Abyssinia. 



B. b. chadensis ranges tlirough Kordofan and the north- 

 western Bahr el Ghazal to the lower White and Blue Niles 

 and on to Port Sudan. It is distinguished by its paler 

 coloration in both sexes on the head and back. 



B. b. nyanz(E ranges north from Uganda to about Malakal 

 on the upper White Nile and through the central and 

 southern Bahr el Ghazal. It may be distinguished from 

 the last race, with which it intergrades, by the darker 

 coloration of the head and back, especially in the males. 



B. b. erlayigeri ranges from Abyssinia down the Sobat, 

 Baro, and Blue Nile rivers just into the Sudan, where it 

 intergrades with the other forms. We are not at all certain 

 as to how far it is distinct from B. b. nyanzm, but as a rule 

 the female appears to lack the reddish tinge or collar on the 

 nape which both the last I'aces possess. We have no 

 examples which we can definitely assert to be of this race, 

 but the birds from Roseires in the Butler collection, which 

 we have placed under B. b. chadensis^ are intermediate 

 between that form and the present race. 



Platysteira cyanea nyansaB. 



Platysteira cyanea nyanza Neum. J. f . O. 1905, p. 210 : 

 Bukoba. 



[B. coll.] 3 Pitias nr. Rejaf Apl. L.E. 



[Chr. coll.] 2 Meridi Jan., 1 Tembura Apl. B.G. 



In his revision of the races of this species (J. f. O. 1905, 

 p. 210) Neumann remarks that P. c. (sthiopica of Abyssinia, 

 only distinguishable from the present race by its smaller 

 size, occurs on the upper Blue Nile. It may therefore 

 extend into the Sudan. We consider that P. albifrons, 

 from Angola, which he treats as a race of P. cyanea, 

 is entitled to specific rank owing to its very distinct female. 

 Both the present race and P. c. cethiopica are distinguished 



