18 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 
Specimens.—Hleven, from localities as follows: 
British East Arrica: Lake Naivasha, 4, including one odd skull 
(KX. Roosevelt, Loring); Merelle River, Marsabit Road, 4 (Heller) ; 
Mount Lololokwi, 3 (Heller). 
There is remarkable uniformity in all characters between specimens 
from Lake Naivasha and the region north of the Northern Guaso 
Nyiro. From the other East African forms, P. furax is readily dis- 
tinguished by the shortness of the rostral portion of the skull. 
In his notes on the baboons at Lake Naivasha, Colonel Roosevelt 
has written: 
The baboons were numerous around this camp, living both among the rocks and in 
the tree tops. They are hideous creatures. They ravage the crops and tear open 
new-born lambs to get at the milk inside them; and where the natives are timid and 
unable to harm them, they become wantonly savage and aggressive and attack and 
even kill women and children.’ 
In Heller’s manuscript journal of the Rainey Expedition are the 
following notes made at Merelle Water, July 23, 1911: 
We sat down to watch the baboons come to the water holes. A troup of about 20, 
consisting of about 5 large males and many females and young, came down. The half- 
grown ones were the most daring and solitary ones came to the water first. Afterwards 
the old males and females came. A little one got into one of our traps and the baboons 
all ran about chattering. An old male made desperate attempts to drag the young 
ont out of the trap and remained behind until driven away. One of our dogs chased 
him and he turned about and drove him away. It is apparent that the old males give 
the troup as much protection as they can. 
PAPIO VIGILIS Heller. 
Plates 3, 4. 
1913. Papio anubis vigilis HetteR, Smithsonian Misc. Coll., vol. 61, No. 19, 
p. 1l. November 8. (Lakiundu River, near its junction with the 
‘ Northern Guaso Nyiro, British East Africa; type in U. S. National 
Museum. ) : 
Specimens.—Two, from the following localities: 
British East Arrica: Archer’s Post, Northern Guaso Nyiro, 1 
(Heller); Lakiundu River, 1 (Heller). 
Baboons from the southern side of the Northern Guaso Nyiro, at 
the two localities listed, have much longer skulls than furaz. The 
rostrum is especially elongated. In this character the species agrees 
with P. lestes from south of Mount Kenia and P. newmanni from 
German East Africa; and is remarkably different from P. furaz, 
which occurs at localities north of the river. Flesh measurements of 
the type-specimen, a very old male, are: Head and body, 700 milli- 
meters; tail vertebre, 540; hind foot, 190; ear, 50. 
1 African Game Trails, Amer. ed., pp. 218-219. 1910. 
