28 EINAR LONNBEEG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC. 



ibeanus, Arvicanthis abyssinicus nairobce and Cephalophus abyssinicus Mndei). Three 

 have been marked E(S) because they themselves live on the verge of the Somali 

 district 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. Lavia and the 

 Baboons of the anubis-grow.^ 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 Mspida, 

 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 Elephant Shrew, the Striped Hyena and the Porcupine 

 only are subspecies of East African species, and some like the Gerenuk extend south- 

 wards a httle 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. 



Tlie genera have mostly a wide range but Xerus is northeastern, and Litho- 

 cranius 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. Arvicanthis pumilio diminutus extends southwards to Matabele land, and 

 Grocidura 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 



