688 Messrs. Sclater and Mackworth-Praod on [Ibis, 



Widely distril)ute(l on granite hills from Kordofan sonth- 

 wards (A.L.B.). 



Keichenow has described a paler form of this species 

 from Man2;u in the Gold Coast hinterland (O. M. 1899, 

 p. 190) as Ce)'chneis a. deserticola. We have a specimen from 

 Gambaga before ns which is certainly slightly paler. It 

 agrees almost exactly with the Jebelein specimen. It may 

 be, therefore, that if this paler desert race is recognizable, 

 it extends to the AYhite Nile, bnt not to the Bahr el 

 Ghazal. 



Erythropiis vespertinus vespertimis. 



Falco vespertinus Linn. Syst. Nat. I'Jth ed. 17(0, p. 129: 

 Ingria, e.(/. Province of I'etrograd. 



Fa/cu vespertinus vespertinus Hartert, Viig. pal. Faun, 

 p. 1078. 



Erijtiiropus vespertinus Butler, Ibis, 1905, p. 3G5. 



[B. coll.] 2 Khartoum Nov. & Jan. 



Irresular in occurrence, abundant one winter and then 

 not seen for years (A. L. B). 



The eastern form F. v. amurensis, which occurs in South 

 Africa in winter, has not yet been recorded from the Sudan, 

 and its migration route probably lies well to the east, though 

 we should not be surprised if it did wander into our 

 limits. 



Dissodectes ardosiaceus. 



Falco ardosiaceus Vieill. Enc. Method, iii. 1823, p. 1238: 

 Senegal. 



Cerc/meis ardosiacea Reichw. V. A. i. p. 636. 



Cerchneis ardesiacus Butler, Ibis, 1908, p. 251, 1909, 

 p. 89. 



[B. coll.] 1 Roseires Apl. Sen. ; 1 Moyen Jan., 1 Tonj 

 Jan. B.G. 



[Chr. col!.] 1 Yei Nov. or Dec. L.E. 



Rarely seen in the northern Sudan, commoner towards 

 the south. 



