191 8.] the Birch of the Anglo-Egyptian Sudan. 425 



purchased by the Leyden Museum from Messrs. Verreaux 

 of Paris many years ago. 



It is perhaps worth while to give the measurements of 

 the wings of birds in the Museum collection, to show the 

 gradual decrease in size from south to north : — 



Cape Colony : (^ 376, 370, 360, 355 ; ? 364. Zululand : 

 ^ 376. Transvaal : S 345, 338 ; ? 354, 349, 344, 335. 

 Damaraland : S 341. Rhodesia: S 337. Angola: ^ 320. 

 East Africa: J 322, 309; ? 3'29. Sudan: ^ 320, 317, 

 315, 313, 299 ; ? 321, 303. Abyssinia : c? 358 ; ? 355. 



Corvus albus. 



Corvus alius P. L. S. Miill. ; Shelley, B. A. v. p. 144. 

 Corvus scapulatus Daud. ; Butler, Ibis, 1905, p. 326, 1908, 

 p. 223, 1909, p. 79. 



[B. coll.] 1 Goz Abu Guma Apl. W.N. ; 1 Renk Jan. U.N. ; 



1 Wau Apl. B.G. 

 [C. & L. coll.] 1 Tonga Feb. U.N. 



Corvus umbrinus. 



Corvus umbrinus Sundev. ; Shelley, B. A. v. p. 149 ; 

 Butler, Ibis, 1905, p. 326, 1908, p. 223, 1909, p. 394. 

 [B. coll.] 2 Khartoum Sept. 

 [C. & L. coll.] 2 Siukat Mch. R.S. 



Rhinocorax affinis. 



Corvus affinis Riipp. ; Shelley, B. A. v. p. 140; Butler, 

 Ibis, 1908, p. 223, 1909, p. 394. 

 [B. coll.] 3 Erkowit Mch. R.S. 

 [C. & L. coll.] 1 Jebeleiu Jan. W.N. 



CryptorMna afra. 



Cryptorhina afra (Linn.), Shelley, B. A. v. p. 161 ; Butler, 

 Ibis, 1908, p. 223, 1909, p. 79. 



[B. coll.] 2 Malakal May June, 4 Taufikia Jan. Mch. 



U.N. ; 1 Wau Mch., 1 Doleiba May, B.G. 

 [C. & L. coll.] 5 Taufikia Jan., 6 Tonga Feb. U.N. 

 [Chr. coll.] 5 Wau July Aug. B.G. 



2h2 



