340 DRYOSCOPUS SENEGALENSIS 
from Gaboon, identified by Verreaux and Cassin with D. affinis 
from Zanzibar, from which this species only differs in the 
absence of the white on the shoulders. 
One of the most remarkable features of this species, how- 
ever, is the variability of the female. There is in the British 
Museum a large series of eight males and twelve females col- 
lected by Bates chiefly at Efulen and River Ja in Camaroon. 
The males are all alike, but the females differ in the colour 
of the puff feathers of the rump, and also in the amount of 
ashy on the mantle. Sharpe considered that there were two 
species among this series, while Neumann also believed that 
there were two species in which the males were indistinguish- 
able and the females only differed. I am unable to make out 
that the differences between the females depend on age or 
season, and am inclined to believe that they must simply be 
regarded as dimorphic forms of the same bird. This species 
was obtained by du Chaillu in Gaboon, on the Ogobai and 
Moonda rivers, and there are examples from Loango (Bouvier), 
and Gaboon (Verreaux), in the British Museum, which match 
the Camaroon series quite well. A female obtained at Yam- 
buya on the Aruwimi River by Jameson, formerly identified by 
me with D. tricolor, appears to be a young bird; the base of the 
bill is somewhat pale and the wing-coverts and quills have pale 
edgings; in this bird the mantle is dark grey and the puff 
feathers mingled white and grey. It agrees very well with the 
description given by Reichenow of his var. grisescens. 
Another bird, also a female, from Mawambi, in the Congo 
Forest, collected by Woosnam, is identified by Ogilvie-Grant 
as D. affinis, and is certainly difficult to distinguish from the 
Zanzibar type, as it has distinct traces of white on the 
shoulders. This is also the case with a male from Ponthier- 
ville, on the Upper Congo, obtained by Carruthers, and also 
identified by Ogilvie-Grant as D. affinis; it also has traces 
