new African Mttmmals. 547 



Djpe. Adult male. B.AF. no. 3. 8. 7. 4. Original num- 

 brr f). Collected IGth January, 1903, and presented by 

 F. W. Isaac, Esq. 



Tachyorycfcs storetji, sp. n. 



Size comparatively large, only exceeded among E. African 

 fornis l)y T. annertena. l?rain-case particularly long, its 

 hngtli greater tlian its breadtli. Nasals long, cx[)anded in 

 front, with well-marked re-entrant lateral curves. Sagittal 

 crest well-developed. Zygomata of medium expansion. 

 Incisors broader in proportion than those of ibcanus. 



Dimensions of the type skull (no external measurements 

 avaihd)lc) : — 



CondyIo-ba*al length 46o mm.; zygomatic breadth 33*6 ; 

 nasals 20 X 7*8 ; brain-ease 2L"5xl9; upper molar series 

 8-5 ; length of bullae 11. 



Hab. Lake Elmeutaita, Brit. E. Africa. 



Type. Adult male. B.M, no. 4.2. 1. 3. Original number 

 500. Collected 10th October, 1903, and presented by C. B. 

 C. Storey, Esq., after whom I have named the species. 



This well-marked form is readily distinguishable by its 

 comparatively large size, long and weli-deliued brain-case, and 

 long nasals. 



Tachyoryctes naivashce, sp. n. 



Size smallest of the group; the skull broad, low, and flat- 

 tened. Nasals small, evenly tapering backwards. Zygomata 

 strong, widely expanded. Sagittal crest not highly developed. 

 Bulla3 of medium size. 



Colour variable, the type light, its face not darker, a second 

 specimen dark, Mith a blackish face. 



Dimensions of the type (measured in flesh) : — 



Head and body 188 mm. ; tail 46; hind foot 24. 



Skull : condylo-basal length 39"5 ; zygomatic breadth 3r3 ; 

 nasals 162 x 6*3 ; brain-ease 17'2 x 18 2 ; upper molar 

 series 7*5 ; length of bulke 10. 



Hab. Lake Naivasha. Alt. 6350'. 



Type. Old female. B.M. no. 8. 2. 6. 1. Original number 

 A. 11. Collected 25th May, 1901, and presented by R. J. 

 Cuninghame, Esq. 



It is curious that this, the smallest East-African Tachyo- 

 ryctes, should occur quite close to the two largest, T. an- 

 nectens and storeyi. Its small size and flattened skull will 

 readily separate it from any other form. 



Tachyoryctes spalacimis, sp. n. 

 A medium-sized species, with the occipital plane unusually 

 slanted forward. 



