ALLEN: MAMMALS FROM THE BLUE NILE VALLEY. 355 
seem to be rare or altogether absent. Rothschild calls the Blue Nile 
Baboon Papio lydekkeri, but Elliot places this as a nomen nudum under 
P. cynocephalus. 
LASIOPYGA GRISEOVIRIDIS (Desmarest). 
Grivet Monkey. 
Cercopithecus griseoviridis Desmarest, Mammalogie, 1820, 1, p. 61. 
The first monkeys seen were near El Mesharat two or three days’ 
journey up the Blue Nile from Singa. From this point to the Abys- 
‘sinian border we saw them frequently, usually in small troops of old 
and young in the large leafy ‘sont’ trees near the river. At Abu Zor 
they were rather tame, coming freely into the great trees above the 
Government rest house, but elsewhere they were shy and commonly 
took to flight on seeing us approach. They appeared well aware of 
the fact that the scattered tree growth afforded no safe retreat, and 
usually when surprised they came at once to the ground and dashed 
off into the thorn scrub. On Gebel Fazogli we watched a troop of 
these monkeys on several mornings. They spent much time on the 
ground or running about among the rocks, searching for fruits of vari- 
ous small trees. The two specimens brought back were both old 
males, found singly on the Blue Nile at El Mesharat and Magangani 
near Roseires respectively. 
On the Dinder River we saw small troops of these monkeys along the 
banks at several places, particularly at Kuka; on one occasion Dr. 
Phillips came upon a small company of them at Um Orug scolding a 
leopard that was crouching among thick bushes. 
An old male shot on the Blue Nile at Magangani had a curiously 
deformed skull. One side of the braincase, orbit, and jaw had de- 
veloped at a much slower rate than the other so that the long axis of 
the skull was turned upon itself, and much deformation of the jaw 
with resorption of the condyle had taken place. 
