94 ^NTr. D. A. Bannermnn on rare Birds [Ibis, 



and white. I have examples in tliis phase of plumage 

 from Uganda, Brit. E. Africa, and S. Abyssinia, and from 

 all these places black birds indistinguishable from adult 

 C. clamosus from South Africa. 



This led me to suppose that C. clamosus and C. jacksoni 

 were very closely allied. As they appear to inhabit the 

 same country, it is impossible to determine which immature 

 birds are the young of C. jacksoni. Certainly the series 

 of immature birds from Uganda resemble the immature 

 specimens of C. clamosus from Natal and the rest of South 

 Africa. 



Until young l)irds are obtained of both forms we cannot 

 definitely say more. The only fully- adult specimen of 

 C. jacksoni in the British Museum is No. 1920.6.7.15, shot 

 at Mpumu, Uganda, by Mr. L. M. Seth-Smith. It is dis- 

 tinguished from C. gabo7iensis by the more heavily barred 

 under surface, the ground-colour of which is white and not 

 cream, and by the uniformly banded under tail-coverts. 



In other respects the adult bird of C.^acytsoni resembles 

 adult C. yahonensis, and had it not inhabited the same 

 country as C.g. mabira, I believe the simplest plan would 

 have been to include it as another subspecies of C. gabonensis. 

 As it is, it must remain as a species. 



Range. We have specimens of C. jacksoni in typical heavily 

 barred plumage from southern Abyssinia, Bahr el Ghazal, 

 British East Africa, Uganda, and northern Angola. 



CUCULUS GABONENSIS MABIRjE, 



[Cuculus mabirce van Someren, Bull. B. O. C. xxxv. 1915, 

 p. 116 — Type locality : Mabira and Kasala Forests, Uganda,] 



This bird I consider a subspecies of Cuculus gabonensis. 

 Dr. van Someren has kindly forwarded me tw^o birds for 

 examination, and Dr. Hartert has sent me the type and 

 another from Tring. The adult bird has glossy blue-black 

 upper parts, pale chestnut throat and breast, and either 

 uniform buffish-white or slightly barred underparts and 

 uniform buff under tail-coveits. The immature of this bird 

 is quite distinct ; the chestnut of the breast extends to the 



