312 Mr. O. Thomas on 



palatal foramina 7 ; length of bulla 8'1 ; length of upper 

 molar series (crowns) 6'7. 



Hah. Deelfontein, Cape Colony. 



Ti/pe. Adult female. B.M. no. 2. 9. 1. 61. Original 

 number 215. Collected 1st April, 1902. Presented by- 

 Col. Sloggett. Two specimens. 



This animal at first sight looks like a small 0. untsulcatusj 

 but may be distinguished by its differently coloured head, its 

 short, slender, thinly haired, and pale- coloured tail as com- 

 pared with the comparatively long well-haired black tail of 

 that species, and by the presence of indistinct grooves on its 

 lower incisors, those of 0. unisalcatus being quite smooth. 



In Mr. de Winton's notes on the species of Otoinys* two 

 names, lyalUda and rufifrons^ have been placed under 0. uni- 

 sulcatus, but have apparently been transposed from the 

 synonymy of 0. Brantsk', to which they both unquestionably 

 belong. The description of the second of them, 0. rujifrons^ 

 agrees in some respects with 0. Sloggetti, but fits still better 

 an immature 0. Brantsii^ in which the normal yellowish 

 colour of the upper surface is as yet only present on the 

 head. In 0. Sloggetti the head is greyer, not more yellowish, 

 than the body. 



Otomys unisulcatus Grantii, subsp. n. 



Like true 0. unisulcatus in all respects, but the grooves on 

 the upper incisors, which are clear and distinct in that animal, 

 shallow and faint, and in some specimens hardly distinguish- 

 able at all. 



Ceneral colour of the same grizzled greyish brown, with a 

 slight tinge of vinaceous, and all other colour-characters as 

 in unisulcatus. Tlie feet, however, are rather clearer yel- 

 lowish. Tail long, heavily haired, black ; greyish proximally 

 below. 



Dimensions of the type (measured in the flesh) : — 



Head and body 166 millim. ; tail 118; hind foot (s. u.) 27; 

 ear 23. 



►Skull : greatest length 39"5 ; basilar length 33 ; zygo- 

 matic breadth 21'3 ; nasals 17 x 5'5 ; interorbital breadth 5 ; 

 interparietal 5"2 x 8'5 ; palate length 18'5 ; diastema 10'5; 

 palatal foramina 8 ; length of upper molar series (crowns) 8 ; 

 length of bulla 7-6. 



y/aA. Deelfontein, Cape Colon3\ 



Type. Old male. B.M. no. 2. 9. 1. 50. Original number 

 127. Collected 13th February, 1902, by C. H. B. Grant, 



* Ann. & Mag. Nat. Hist. (7) ii. p. o (1898). 



