38 EINAR LONNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
Naivasha, British East Africa, under the name of Lasiopyga pygerythra callida. As 
this race is said to have »less yellow in coloration of back» it can hardly need 
further comparison with the present specimens. The feet are said to be black even 
in the young specimens. 
This monkey is the »Tumbili» of British East Africa. In its habits it is entire- 
ly different from the Kima. The Tumbili does not live in thick forest but belongs 
to more open ground. It is seen in the thornbush as well as on the acacia steppe 
and runs much on the ground, sometimes rather far from any trees. The thin forest 
belts which often fringes the East African rivers appears to be the regular home of 
the Tumbili and to them they return and take refuge in the highest trees if any 
danger threatens them. 
Sometimes they appear to have certain routes which they know of and use 
when they seek safety. At Guaso Nyiri below Chanler Falls I had once seen a band 
of Tumbilis run down from the thornbush to the trees at the river side, but when 
I came there they had disappeared. A few days later I observed them almost in 
the same place again, and I ran as quickly as possible with my gunbearers to inter- 
cept them. It appeared almost certain that we should succeed because there were 
only a few trees on our side of the river. When we came nearer, however, I saw 
the last of the Tumbilis take a flying leap from a tree on a small island to the 
opposite side, and thence they continued to travel with great speed along the river 
on the opposite side. An examination of the conditions revealed how the Tumbilis 
had reached safety. A tree had fallen from the north bank and lay across a branch 
of the river forming a bridge to the western end of a small narrow island. At the 
eastern end of the same a big tree leaned over towards the southern side so that 
from its crown the monkeys could make a long leap and get hold of the branches 
of a tree on the southern side. This accounted for the mysterious disappearance 
the first time, and explained also why the Tumbilis ran down to the river at the 
same place the second time. This was evidently a, to them, well known route which 
they had used before. Only a young female which remained on the island, possibly 
not daring to make the Jast long leap across the southern branch of the river, could 
be added to the collections. The Tumbilis occurred usually in small flocks but 
several times single Tumbilis were seen in the interior of the thornbush, sometimes 
far from any other water than that in the holes dug by the Rendiles, as at Njoro 
and Thera, in otherwise dry riverbeds. 
1 Honuister has recently (Smithson. Misc. coll. Vol. 56 N:o 2. Washington 1910, p. 11) described a 
monkey of the pafas-group from Brit. E. Africa under the name of Erythrocebus whitei. The type locality of 
this species is »Nzoia River, Guas Negishu Plateau». Marscutm described 1905 a monkey from Ikoma and 
belonging to this group under the name of EH. bawmstarki. Although I have not myself seen any red monkey 
during my expedition to Brit. E. Africa I think it worth mentioning that I heard stated by Dr. Wausn that he 
had shot a red monkey which according to the description must have been a member of the patas-group. This 
happened not far from Ulu station of the Uganda railroad in April 1911. Dr. W. observed it running at a 
long distance and shot at it believing it to be a Cheetah, and he confessed to be very astonished to see this 
strange-looking animal when he had killed it. The occurrence of a monkey of this group as far south-east as 
Ulu appears rather interesting, but as I have not seen the specimen I cannot tell whether it belongs to any of 
the species mentioned above, . 
