462 MESSRS. O. THOMAS AND H. SCHWANN ON THE [Apr. 19, 



Bullse unusually Jarge. Upper incisors each with one indistinct 

 median groove. 



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



Head and body 160 mm. ; tail 219 ; hind foot 43 ; ear 24. 



Skull : greatest length 45 mm. ; basal length 36 ; zygomatic 

 breadth 24; brain-case, breadth 18; interorbital breadth 7; 

 nasals 19'4x3:5; diastema 12*3; length of palatine foramina 

 8'8 ; length of bulla 12 ; upper molar series 7. 



Hah. Burumba, Ankole. Alt. 5000 feet. 



Ty23e. 'Female. B. M. No. 4.2.6.13. Original No. 513. Col- 

 lected August 1903. 



This distinct species appears to be allied to T. valida Boc. and 

 T. liodon Thos., sharing with them the unusual shallo^^^less of 

 the incisive gi-ooves *, b\it it is easily separable by its much 

 larger skull and white-tipped tail. 



Externally it has a close resemblance to Gerbilliscus hoehmi 

 Noack, to which Dr. Matschie appears to have referred it t, but 

 its single incisive groove and much larger bullae readily distinguish 

 it from that animal. 



14. Otomys irroratus tropicalis Thos. 



5 . 458. Burumba, Ankole. 

 Colour of iris bUck (IF. G. I).). 



15. LoPHUROMYS AQUiLus True. 



cJ (in spirit). Burinnba, Ankole. 



16. Arvicanthis abyssinicus Riipp. 



c5'. 515. 2- 455; 456; 457. Burumba, Ankole. 

 Colour of iris black {W. G. D.). 



17. Tachyoryctes splendens ibeanus Thos. 



6. 461; 462; 463; 464; 503; 504; 507; 508. $. 465; 

 505 ; 506 ; 509. Burumba, Ankole. 



Tln'ee specimens in spirit and several skeletons. 

 Colour of iris " seal-broAvn " {W. G. D.). 



18. Lepus crawshayi de Wint. 



$ . 544. Burumba, Ankole. 

 Colour of iris raw umber (W. G. D.). 



19. Procavia stuhlmanni Matsch. 



6 . 510. § . 469 ; 470. Burumba, Ankole. 

 (5 and 2 in spirit. 



Colour of iris black {W. G. D). 



These specimens have enabled us to make the interesting 

 discovery that there is a third mammary formula found in the 



* See Thos. Ann. & Mag. N. H. (7) ix. p. 442 (1903). 



t Siiug. Deutsch-Ost-Afrika, p. 54 (1895). Specimen from Bukoba, Victoria 

 Nyanza. 



