lo Field Museum of Natural History — Zoology, Vol. X. 



Otomys angoniensis elassodon subsp. nov. 



Type from Naivasha, British East Africa. No. 16684, Field Mu- 

 seum of Natural History. Adult female. Collected January 29, 

 1906, by E. Heller. 



Characters. Similar to Otomys angoniensis, but paler and more 

 grayish; molars narrower; nasals broadly expanded; m'^ with seven 

 laminae. Distinguished from Otomys nyikce canescens by slightly 

 darker color but especially by more elongate skull, narrower brain- 

 case, and narrower molars. 



Measurements. Type: Total length 270; head and body 183; 

 tail vertebrae 87; hind foot (c. u., dry) 29; ear 21. Skull of type: 

 Greatest length 41; basilar length 34-3; zygomatic breadth 21; 

 length of nasals 17.7; greatest breadth of nasals 8.9; least inter- 

 orbital breadth 4.5; depth from highest point of orbit to alveolar 

 border at front of m^ 13.8; postpalatal length 15; palatine slits 8; 

 maxillary toothrow 8.2; greatest width of mi- 2.4. 



Otomys nyikae canescens subsp. nov. 



Type from Kijabe, British East Africa. No. 16682, Field Museum 

 of Natural History. iVdult male. Collected January 20, 1906, by 

 E. HeUer. 



Characters. Similar in size and cranial characters to Otomys 

 nyikce, but color much paler and grayer; general effect of upperparts 

 grizzled wood brown or broccoli brown instead of deep russet ; nasals 

 broadlv expanded anteriorly; m^ with seven laminae. Color much 

 as in Otomys a. elassodon, but slightly more grayish; skull shorter 

 and broader; molars wider. 



Measurements. Type and two topotypes, respectively. Total 

 length 259, 255, 242; head and body 175, 165, 157; tail vertebrae 

 84, 90, 85; hind foot 29, 30, .^7.5; ear 19.5, 21, 20. Skull of type: 

 Greatest length 37.2; basilar length 30.9; zygomatic breadth 19.6; 

 length of nasals 17.1; greatest breadth of nasals 8.5; least inter- 

 orbital breadth 4.6; depth from highest point of orbit to alveolar 

 border at front of m'^ 12.8; postpalatal length 13.8; palatine shts 

 6.8; maxillary toothrow 8.4; greatest width of m-i 2.6. 



Arvicanthis barbarus convictus subsp. nov. 



Type from Voi, British East Africa. No. 17206, Field Museum 

 of Natural History. Adult male. Collected April 16, 1906, by 

 E. Heller. 



Characters. Allied to Arvicanthis barbarus spekei, A. b. zebra and 

 other forms having unbroken stripes. Size about as in spekei but 



