Sioamp-Iiats of East Africa. 



1 :,:, 



Dimensions of the tjpe (measurod in the flesh) : — 



Head ami l)0(ly l'>0 mm.; tail 81; hind loot 20; 



Skull: <;rc.itcst length 37'8 ; basilar lenp;th 30 ; condylo- 

 iiicisive leiigtii 35*4; zygomatic hreadth 19*5; interorbitnl 

 constriction 4*4 ; length oE nasals IG'8 ; greatest l)ieadth 

 across expanded part of nasals (J*5 ; depth from highest point 

 of orbit to alveolar border at front of rtt' 13'3 ; length of 

 ]ialatal foramina fi'9 ; postpalatal length 13'6; length of 

 nj)[)er molar series from anterior alveolar border to back of 

 last molar 9'5 ; length from anterior base of enamel on 7?^' to 

 back of m^ 8*t» ; greatest width of in^ 23. 



Ifiih. Lake OlboUossat, Naivaslia Province, British East 

 Africa. 



Tt/pe. Adult female. B.M. no. 12. 7. 1. 431. Original 

 nuniber 79. Collected and presented by A. Blayney Percival, 



This Otomi/H is evidently quite closely allied to the ^lolo 

 species; tin* difference in siz(i and niucli ])aler colour are the 

 chief distinguishing characteis. That a race of the ]\Iolo 

 sj)ecies should occur at OlboUossat is n(jt surprising when 

 the geographical condition.s are considered. 



Mr. Percival collected two further specimens of this 

 ( Jtomys at the type-locality ; the dimensions are given as : 

 liead and l)ody l.'iO, 143 mm. ; tail 86, 82 ; hind foot 26, 26. 

 The skulls both show the same curious arched formation, the 

 interorbital region being considerably elevated and the nasals 

 and cranial outline depressed. 



(5) Otomya tliomasi squalus, subsp. n. 



Size rather larger than in the foregoing race, colour con- 

 .-■iderably darker and richer. 



Size of body greater than in t. vuiUcnx, but markedly less 

 than in thomasi. (Jeneral colour of dorsal suiface a rich 

 brownish huff, the effect much darker and browner than in 

 inaUeus. Fla.iks not consj)icuously lighter thin back. Sides 

 of face and head similar in colour to back, without any 

 prominent light areas behind the ears. Backs of hands and 

 feet white, washed with pale buff. Underpartsof body rather 

 darker throughout. Tail as in the other mcnil)er3 of this 

 group. 



Skull a trifle larger than that of mnl/eus, witii broadi-r 

 nasals and longer palatal foramina. Cranial (limensioiia 

 COnsidi'inliK' Ii~s iIi.im m f/ioiiifisi. 



