94 Mr. D. A. Bannerman on rare Birds [Ibis, 
and white. I have examples in this 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 birds 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. gabonensis 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. jacksoni resembles 
adult C. gabonensis, and had it not inhabited the same 
country as C. g. mabirce, 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. 
CuOULTJS GABONENSIS MABIRiE. 
\_Cuculus mabirae 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 two 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 huffish-white or slightly barred underparts and 
uniform buff under tail-coverts. The immature of this bird 
is quite distinct ; the chestnut of the breast extends to the 
