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basin is, as yet, quite uncertain. The authorities of the Congo Free State 
have, up to the present time, persistently neglected to obtain any accurate 
information of the zoology of the great region which they have occupied. 
The little we know of the animals of this wide area is based upon fragmentary 
specimens obtained by passing explorers. It is very probable, however, that 
C. melanorheus may range over nearly the whole of the great woody basin of 
the Congo and its tributaries. But when we come to the eastern slope of 
Africa, from various parts of which specimens referred to this species have 
been received, we meet, as Sundevall has pointed out, with a slightly different 
form, which for the present it is proposed to regard asa subspecies (following 
Fitzinger) as Cephalophus melanorheus sundevalli. 
The fact is that, as regards these small Duikers, a far better series from 
the various points of their range must be rendered accessible before we can 
come to any accurate determination as to their systematic arrangement and 
distribution. Herr Matschie informs us that some specimens received in 
Berlin from Dar-es-Salaam, in German East Africa, rather more resemble 
C. monticola than C. melanorheus ; so here is another riddle yet unsolved. 
August, 1893. 
