1918.] the Birds of the Anglo-Egyptian Sudan. 471 



that this is not so, and that it is a true example of natural 

 erythrism. He knew the bird while alive quite well, and is 

 convinced that it could not have been handled, and also on 

 skinning it the whole under surface of the skin was found 

 to be of a rich pink colour, deepening into carmine under 

 the wings and in other places. 



Passer griseus eritresB. 



Passer diffusus nee Smith, Butler, Ibis, 1905, p. 315, 

 1908, p. 217, 1909, p, 77. 



[For other references, see below.] 



[B. coll.] 2 Setit R. May, Kas. ; 5 Roseires, July-Sept. 



Sen. ; 1 Jebel Melbis Apl. Kor. ; 1 Chak Chak Feb., 



6 Wau Jan. Mch. E.G. ; 2 Mongalla. 

 [C. & L. coll.] 4 Kamisa, 2 near Sennar, Sen. ; 2 Kosti, 



W.N. ; 1 Bahr el Zeraf, U.N. 

 [Chr. coll.] 1 Meridi Jan., 1 Tembura Apl. E.G. ; 1 Yei 



Dec. L.E. 



Passer swainsoni swainsoni. 

 [For references, see below.] 

 1 Port Sudan Apl. E.S. 



Passer griseus and its allies. 



We have gone carefully through the large series of these 

 Grey Sparrows in the British Museum, and have come to the 

 following conclusion as regards the species and races. 



Passer griseus griseus. 



Fringilla grisea Vieill. Nouv. Diet. xii. 1817, p. 198: 

 United States ! [Senegal, apud Lafr. Rev. Zool. 1839, p. 95]. 



Pyrgita gularis Less. Rev. Zool. 1839, p. 45 : Senegal. 



Passer occidentalis Shelley, Ibis, 1883, p. 548 : ? Niger. 



Passer diffusus thierryi Reichw. O. M. 1899, p. 190 : 

 Mangu, N. Nigeria. 



This race extends from Senegal to northern Angola and 

 through Nigeria, Cameroon, and French and Belgian Congo 

 to N. Rhodesia. 



Back reddish brown ; underside greyish white ; abdomen 

 almost white. Wing 78-88 mm. 



SER. X. VOL. VI. 2 L 



