Sicanip-Bats of East Africa. 159 



Skull : greatest length 41 ; basilar length 31 ; zygomatic 

 breadth 20'3; breadth of brain-case 16'3; length of nasals 18 ; 

 breadth across expanded portion 7*4 ; depth from highest 

 point of orbit to alveolar border at front of m^ 12*4 ; palatiiar 

 length 18*7 ; length of upper molar series from front alveolar 

 border to back of m^ 10. 



Hah. Elgonji, Mt. Elgon. Altitude 7000 feet. 



Type. Adult male. B.M. no. 10. 4. 1. 78. 



(10) Otomys tropicalis vivax, subsp. n. 



Allied to 0. t. elgonis, but smaller in size and considerably 

 paler in colour. 



Dimensions of head and body markedly less than in the 

 Elgon form ; tail rather long. 



General colour of dorsal surface much paler and more 

 suffused with light brownish buff, lacking the dark wash 

 which is the dominant note in tlie colouring of elgonis. 

 Flanks and sides of head rather lighter and more buff- 

 coloured than back. Muzzle and sides of face bright buff. 

 Backs of hands and feet dirty brownish buff. Under parts 

 of body pale slate-grey overlaid vvitli bright creamy buff, 

 the general effect much lighter and more buff-coloured than 

 in the Elgon race. 



Skull considerably smaller witii much smaller teeth. 

 Nasals very much as in elgonis, the subterminal constriction 

 not quite so well defined. The lamina formula as in trojn- 

 calis, but the last lamina of m^ is very small and not entirely 

 separated from the 6th. 



Dimensions of the type (measured in the flesh) : — 



Head and body 147 mm. ; tail 83; hind foot 26 ; ear 21. 



Skull: greatest length 38-4; basilar length 30*5; con- 

 dylo-incisive length 35-3 ; zygomatic breadth 19"3 ; inter- 

 orbital constriction 4-2; length of nasals 16'6 ; greatest 

 width across expanded part of nasals 7 ; depth from highest 

 point of orbit to alveolar border in front of wi^ 11*8 ; length 

 of palatal foramina 7 ; postpalatal length 13-7; length of 

 upper molar series from anterior alveolar border to back of 

 last molar 9 ; length from anterior base of enamel on m^ to 

 back of m'^ 8"3 ; greatest width of m^ 2*2. 



Hab. Mt, Nyiro, south of Lake Rudolf, East Africa. 

 Altitude 8000 feet. 



Type. Adult female. B.M, no, 12. 7. 1. 425. Original 

 number 391. Collected by A, Blayney Percival, Esq., on 

 March 24tli, 1911, and presented by him to the British 

 Museum. 



