Sioamp-Rats of East Africa. 151 



l\ Nasals very brocad nnteriorly (more 



than 8 mm. in width). 



<tr. Transition Irom broad to narrow 



region marked by a distinct angle, 



«^ Size larger; hind foot 34 mm. 



in length, greatest length of 



skull 4G mm. (Kaganibah, 



Uganda.) (12) rnheculus, sp. n. 



P. Size smaller ; liiud foot 26-3 mm. 

 in length, greatest length of 

 skull 39 mm, (Rombo, Kili- 

 manjaro,) (13) diiin&rmi, Thos. 



b^. No angular transition between 

 broad and narrow portions of 

 nasals. 

 «^, Size larger ; greatest length of 

 skull 40 mm. or more. 

 «*. General colour brownish ru- 

 fous mixed with buff. 



(M'Kombhuie, Angonilaud.) (14) a)i(/onicnsis^V<xo\v^\\{. 

 A'. General colour olive-grey 

 washed with brown. (Nai- 



vasha, B.E.A.) (1-"^) «• elassodon, Os^. 



l^. Size smaller ; greatest length of 



sliuU less than 40 mm, IS^asals 



very short. 



«'. Colour rufous brown speckled 



with buff. (Nyika Plateau, 



N. Nyasa.) (IG) nyilcce, Wrought, 



bK Colour olive-grey tinted with 

 buff. (Kijabe, Naivasha Dis- 

 trict, B.E.A.) (17) n. canescens, Osg, 



C. Lower incisors with two deep grooves. 

 Ventral surface of tail light, 

 «. Skull arched ; iuterorbital region raised 

 up ; nasals and brain-case depressed. 

 a', m^ with laminse. (East liuwen- 



zori.) (18) dartmouthi, Thos. 



b'. m^ with 7 laminse. 



«". Size smaller; greatest length of 

 skull 35-7 mm. General colour 

 blackish brown. (Mt. Elgon.) . . (IQ) jacksoni^Thoa, 

 h^. Size larger ; greatest length of 

 skull 39-7 mm. General colour 

 bright yellowish buff suHused 

 with brown. (12 miles S. of 



Lake OlboUossat.) (20) percivali, sp. n. 



c'. m^ with 8 laminse. (Shoa, Abys- 

 sinia.) (21) typus, Ileug. 



b. Skull not arched ; m^ with 9 laminje. 



(Charada, Katfa.) (22) fortioi; Thos. 



