EAST AFRICAN MAMMALS IN NATIONAL MUSEUM. 9 



TsAvo — -Station where the railroad in British East Africa is crossed by the Tsavo 



River; southeast of Mtoto Andei and 133 miles from Mombasa. Altitude 1,530 



feet. K 5. 

 TuHAH Water — Tributary to the upper Northern Guaso Nyiro, northwest of Mount 



Kenia. 1 4. 

 Ulukenia Hills — On the Athi Plains east of Nairobi. Also written Ulucania or 



Lukenia. J 4. 

 Uma— A village on the east bank of the Bahr el Jebel just north of Niraule, Uganda. 



H2. 

 UsERi River — Fifteen miles east of Kilimanjaro, in British East Africa. K 5. 

 Yoi — Station on the railway 103 miles northwest from Mombasa. Altitude 1,830 



feet. K 5. 

 Vol River — Crosses the railway at Voi station, 100 miles from Mombasa, and flows 



into the Indian Ocean between Melinda and Mombasa. Also called Muhowa, 



or Muho wa Mangudo. K 5. 

 Wambugu — Between Fort Hall and Mount Kenia at 5,300 feet altitude. J 4-5. 

 Wange — On the coast of British East Africa about 50 miles north of the month of the 



Tana River. J fi. 

 West Kenia Forest Station — A forest station on the west side of Mount Kenia at 



7,500 feet altitude. I-J 4-5. 

 Yala River — See Lukosa River. I 3. 

 Zanzibar — Town on Zanzibar Island. L 5. 



The arrangement of the families of rodents follows the outline 

 given by Miller and Gidlev.^ The plates illustrate the skulls of all 

 type-specimens of mammals of the orders included in this part 

 which are in the museum. Three type-specimens {Lemniscomys 

 dorsdlis mearnsi, Acomys ignitus montanus, and GrapMurus murinus 

 isolatus) are skins only and consequently are not figured. Of the 

 75 type skulls 57 are here figured for the first time. 



Order RODENTIA. 



Family SCIURID.^. 



Genus HEUOSCIURUS Tiouessart. 



1880. Heliosciurus Trouessart, Naturaliste, vol. 2, p. 'i!>2. October. (H. 



gamhianiLs}) 

 1909. Sciurus Thomas, Ann. aad Mag. Nat. Hist., ser. 8, vol. 3, p. 469. June. 



(Part; not of Linnaeus.) 

 1916. jEthosciurus Thomas, Ann. and Mag. Nat. Hist., ser. 8, vol. 17, p. 271, 



March. (H. poensis.) [Valid as a subgenus.] 



In a revision of the genera of African squirrels published by 

 Thomas in 1909,^ three African species were provisionally referred 

 to Sciurus, chiefly because of the presence in each of the small pm^, 

 usually absent in Heliosciurus. No other characters are given to 

 distinguish Heliosciurus from Sciurus m the diagnoses and key, 



1 Synopsis of the supergeneric groups of Rodents, Journ. Wasliington Acad. ScL, vol. 8, pp. 431-448, 

 July 19, 1918. 



^See Thomas, Ann. and Mag. Nat. Hist., ser. 8, vol. 3, p. 470. June, 19C9. 



* The Generic Arrancoment of the African Squirrels, Ann. and Mag. Nat. Hist., ser. 8, vol. 3, pp. 467-475, 

 June, 1909. 



