19 a i.] collected in Southern Cameroon. 95 
throat and chin and is barred with black; the underparts 
are almost white, barred with black—giving the birds a much 
lighter appearance than C. jacksoni. with which it might at 
first sight have been confused. 
1 have one remarkable bird entirely black, but with several 
barred feathers still remaining in the breast and flanks—the 
barred feathers are fresh feathers, the black much worn, 
showing that the bird is changing from black plumage (?) of 
the young into the barred plumage. It is impossible to 
determine whether it is a young jacksoni or mabirce. I am 
inclined to think the latter, as the feathers of the young of 
gabonensis are entirely black and in the adult become barred. 
This I believe to be a parallel case, but it is worthy of 
study by anyone working at this group. The specimen 
alluded to is a male obtained by Mr. L. M. Seth-Smith at 
Mpumu, Uganda, on the 28th of July, 1912, Brit. Mus. 
Beg. No. 1913.7.16.31. 
At first I believed that this was C. jacksoni turning into a 
black bird, but on closer examination along with Mr. H. F. 
Witherhv of the feathers, he drew my attention to the fact 
that the barred feathers were new, the black feathers old, 
and in these conclusions I agree. The young of either 
C. jacksoni or C. mabirce are therefore black. It is not an 
example of C. clamosus. 
The range of this Cuckoo is not yet known apparently. 
The type came from the Kasala Forest and the other 
specimens from Mabira and Bugoma in Uganda. There 
are three birds in the Jackson collection from the Mabira 
and Bugoma Forests. The subspecies is not represented in 
the British Museum. 
Pachycoccyx validus. 
Cuculus validus Beichw. Orn. Centralbl. 1879, p. 139— 
Type locality : Muniuni, Tana Biver, British East Africa. 
Pachycoccyx validus Sharpe, Ibis, 1907, p. 435 ; Bates, 
Ibis, 1911, p. 499. 
Two specimens of this rare Cuckoo were obtained 
(Nos. 5939 and 4220), and haye been presented to the British 
