Sicavip-I\afs of Eaat Africa. IGl 



Type. Atlult mule. B.M. no. 11. 12. 2. 1. Original 

 miniber I'Jli). Collected by i^Ir. Kobiii Kemp on Februaiy 

 l.jfh, 1911. 



The very much darker-coloured pelage and less abruptly 

 narrowing nasals distinguish this form iVom ehjonis and 

 tropicalis. 



In addition to the four specimens collected by Mr. Kemp 

 on the Jombcni Rangf, this form has also been obtained by 

 Mr. Percival on the Larrogie Mountains (altitu<le 7700 feet) 

 north of the Northern (tiuiso Nyiro, and at Mweru (4:500 

 feet), and on the Embu Road (-iOOO feet). 



O. oresles doUmani, its near neighbour, is immediately 

 distinguished by the fact that there are only six laminie 

 in m\ while the Jombeni race possesses the same laminii 

 formula as the tropicalis group, /. e. 4*^'4' 



Group 3. 



Nasals very broad anteriorly (more ihau 8 mm. in widtli), transition 



from broad to narrow region marked by a distinct Jin<jle. 



(12) Otomys ruheculua, sp. n. 



A very large species related to tropicalis. 



Size considerably greater than in any other East African 

 species, head and body measuring 201 mm. in length and 

 tlie hind foot 34. 



General colour very mucli as in angoniensis, dull brown 

 lined with buff. Face and sides of head less richly tinted 

 with buff; orange rings around eyes absent. Ventral sur- 

 face of body much as in tropicalis. Tail very long, dull 

 brownish black above, dirty cream-coloured below. 



Skull very large and massive. Nasals very broad in front, 

 the transition to the narrow j)ortion marked by a fairly 

 distinct angle, much more so than in angoniensis or nyik(v. 

 lirain-case very broad ; general outline of cranium nearly 

 horizontal. Auditory bulliC exceptionally prominent. 'Teeth 

 large ; in^ with 7 laminre. 



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



Head and body 201 mm.; tail 112; hind loot 34; 

 ear 25. 



ISkulI : greatest length 4(]"2; basilar length 37; zygomatic 

 i)reailth 22 ; breadth of brain-case 18*2 ; greatest width across 

 nasals 9 ; width at constriction behind anterior expansion 5*2 ; 

 depth from highest point of orbit to alveolar border at front 

 of m"" 15*3; |)alatilar length 21 ; length of palatal fora- 

 mina 9 ; length of ujtper molar series from front alveolar 

 Ijorder to back of 7«^ 11 ; crowns 9'3. 



Ann. cO iJag. N. I hat. Ser. 8. Vol. xv. 11 



