28 EINAR IÖNNBERG. MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 
ibeanus, Arvicanthis abyssinicus nairobe and Cephalophus abyssinicus hindei). Three 
have been marked E(S) because they themselves live on the verge of the Somali 
distriet but have their relatives in East Africa. Seven species can be counted to the 
Somali fauna and they are all from the Guaso Nyiri district. Four carnivores and 
the Rhinoceros are practically distributed over the whole Eastern Southern steppe 
region even if the last does not extend to the northwestern parts of that region. 
Canis adustus goes as well west as south but not further north. Zavia and the 
Baboons of the anubis-group range across tropical Africa. 
The genera have mostly a wide range. One northeastern genus Xerus, and a 
Somali genus, Lithocranius, live in the Guaso Nyiri district and one genus from the 
Athi plains, Zelotomys, is endemic, while Tachyoryctes may be termed northeastern. 
As a general result of this discussion can be said that the fauna of the Athi 
plains is typically East African s. str., but that some members of the Somalifauna 
cross to the acaciasteppe on the southern side of Guaso Nyiri. 
The list of the thornbush mammals (conf. the table p. 17, 18) from the northern 
side of Guaso Nyiri comprises about 40 species. Among these 3 viz. Nycteris hispida, 
the Leopard and Hippopotamus are found in the whole Ethiopian region and 2 viz. 
the Blackbacked Jackal and the Rhinoceros in the whole Eastern Southern steppe 
region except the northwest. Grants Zebra with southern affinities is only a rare 
guest on the northern bank of Guaso Nyiri in this part of the country. The Buf- 
falo as well probably does not extend further north. The Waterbuck and the Impala 
are represented by separate geographic races here near their northern boundary line 
and they do not reach the genuine Somaliland. The Tumbili monkey and Pattersons 
Eland may be regarded as East African near their northern frontier as well. Papio 
anubis furax being described from the Baringo district, and Erinaceus hindei from 
the central parts of British East Africa may be counted to the East African fauna 
but they have their nearest relatives further north resp. Papio a. doguera and Erina- 
ceus albiventris. The remaining lot, or about 26 species, may be counted to the 
Somali fauna, even if the HElephant Shrew, the Striped Hyena and the Porcupine 
only are subspecies of East African species, and some like the Gerenuk extend south- 
wards a little further than the others. Several of the mammals found here form 
separate subspecies of the species found in northern or central Someliland, but on 
the whole the fauna can be said to be a real Somali fauna. Even if it is to some 
degree modified and has representatives of its own it is quite of Somali type. 
The genera have mostly a wide range but Xerus is northeastern, and Litho- 
cramius and Heterocephalus are characteristic of the Somali district. 
The mammals (conf. table p. 20, 21) obtained or observed by this expedition in 
the forests at the four different localities mentioned are not very numerous as they 
only amount to 32. Of these the Baboon is not a real forest animal, although it 
takes its refuge to the forest and thus was observed there. The Leopard has a very : 
wide range. Arvicantlis pumilio diminutus extends southwards to Matabele land, and 
Crocidura turba to Nyasa land. The Bongo and the Black Forest Hog evidently 
represent animals which typically belong to the Western forest region. Even if they 
