Fes., 1910. New East ArricAan MAMMALS—OsGoop. 9 
(s. u.) 25.3 (24-26.5); ear 20.7 (19-22). Skull of type and an adult 
from Lake Elementeita, respectively: Greatest length 32.7, 31.8; 
basilar length 25.3, 24.4; zygomatic breadth 15.9, 14.9; nasals 11.9, 
12.3; least interorbital breadth 5, 4.7; postpalatal length 11.8, 11.2; 
diastema 8.4, 8; palatine slits 7.8, 7.2; maxillary toothrow 5.1, 4.6. 
Cricetomys gambianus kenyensis subsp. nov. 
Type from south side of Mount Kenya, British East Africa. No. 
17517, Field Museum of Natural History. Adult male. Collected 
by C. E. Akeley. 
Characters. Most similar to Cricetomys gambianus proparator 
but proximal dark color of tail more extensive, occupying at least 
three-fifths of the length of the tail; color of upperparts somewhat 
paler especially on the sides which are more contrasted with the back. 
Skull slightly larger than in proparator; nasals broader posteriorly, 
their outer sides nearly parallel; rostrum slightly thicker dorso- 
ventrally; infraorbital plate narrower and less forwardly projecting. 
Somewhat similar to C. g. viator but much darker in color, with a more 
marked dorsal area. 
Measurements. Skull of type: Greatest length 76.3; basilar 
length 62.6; zygomatic breadth 36.5; least interorbital breadth 12; 
nasals 31; postpalatal length 25.5; diastema 25; palatine slits 8; 
maxillary toothrow 11.3. 
Otomys thomasi sp. nov. 
Type from Molo, British East Africa. No. 16698, Field Museum 
of Natural History. Adult female. Collected March 16, 1906, by 
E. Heller. 
Characters. Allied to Otomys irroratus tropicalis and other species 
having narrow nasals and m2 with seven laminz, but color widely 
different and skull decidedly arched or “humped.” Dominant 
color of upperparts varying from pale cinnamon to wood brown in- 
stead of rich hazel as in tropicalis; a rather conspicuous patch of 
creamy buff behind the ears; fore and hind feet entirely creamy buff; 
underparts wood brown. 
Measurements. Type and one topotype, respectively: Total 
, length 282, 283; head and body 184, 180; tail vertebra 98, 103; hind 
foot (s. u.) 30.5, 31; ear 24, 23.5. Skull of type: Greatest length 
43-3; basilar length 34.6; zygomatic breadth 21.7; length of nasals 
20.7; greatest breadth of nasals 7.5; least interorbital breadth 3.4; 
depth from highest point of orbit to alveolar border at front of m? 
14.5; postpalatal length 15.1; palatine slits 7.5; maxillary toothrow 
9.2; greatest width of m!? 2.5. 
