676 Messrs. Sclater and Mackworth-Praed on [Ibis, 



skins from Mongalla which we believe to be nothing but 

 young birds. These are distinctly greenish, changing to 

 brown on the head, and appear to us to accord very well 

 with Cretzschmar's description and figure. If our con- 

 clusion is correct, the name of this bird will of course have 

 to be changed back to C. brevicaudata Cretzsch. 



Prinia gracilis gracilis. 



Sylvia gracilis Lichtenstein^ Verz. Doubl. 1823^ p. 34 : 

 Nubia. 



Burnesia gracilis Butler, Ibis, 1905, p. 332. 



Prinia gracilis Butler, Ibis, 1909, p. 395. 



[B. coll.] 2 Khor Arbat May, R.S. ; 2 Khartoum Apl. 

 July. 



[C. & L. coll.] 4 Port Sudan Dec. Apl. R.S. 



There is some doubt as to the distribution o£ the races of 

 this bird. The Ued Sea Province birds seem slightly darker, 

 but a considerably larger series would be necessary before 

 we could offer any opinion. 



Prinia mistacea mistacea. 



Prinia mistacea Rlipp. Neue Wirbelth. 1835, p. 110 : 

 Gondar, N. of L. Tsana, Abyssinia. 



Prinia mystacea and murina Butler, Ibis, 1905, p. 332, 

 1909, p. 82. 



[B. coll.] 1 Disa Apl., 2 Roseires Aug. Sen. ; 1 nr. Renk 



Dec, 1 Taufikia Apl. U.N. ; 1 Bahr el Jebel May, 



2 Bahr el Zeraf June, 4 Kenisa summer, Mon. ; 



1 Wau Apl. E.G. 

 [C. & L. coll.] 1 Singa, 1 Eneikliba, 10 Kamisa Dec. 



Sen. ; 13 White Nile between Jebelein and Lake No 



Jan. Feb. 

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



The races of Prinia mistacea do not appear to have been 

 hitherto worked out. The following is the result of an 

 examination of the long series in the British Museum : — 



