Feb., 1910. New East African Mammals — Osgood. 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 irroratns tropicalis and other species 

 having narrow nasals and m-i with seven laminae, 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 vertebrae 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 1 5.1 ; palatine slits 7.5 ; maxillary toothrow 

 9.2; greatest width of m^- 2.5. 



