432 MK. OLDFiEiD THOMAS ON [May 4, 



buffy yellow, clearer on sides. Belly white, the bases of the hairs 

 slaty. Ears larger and rounded. Upper surface of hands and 

 feet whitish. Tail long, thinly haired, coarsely scaled (10 to the cm.), 

 brown above, rather paler below. 



Skull short and broad, with a large rounded brain-case. Muzzle 

 broad and flat. Supraorbital ridges delicate, widely divergent 

 behind. Palatal foramina very long, reaching to the middle of m.'. 

 Posterior palate reaching more than 1 mm. behind ni.'. Incisors 

 narrow, very pale-coloured, nearly or quite white near their tips. 

 Molars broad and rounded, their cusps well defined. 



Dimensions of the type, in skin : — 



Head and body 157 mm. ; tail 151 ; hind foot 27 ; ear 18. 



Sliull — basilar length 30 ; greatest breadth 19 ; nasals 14x4-4; 

 interorbital breadth 5-2 ; interparietal 9x3-4; palate-length from 

 henseUon 18 ; diastema 10*1 ; palatal foramina 10 X 2-1 ; length 

 of upper molar series 6-7. 



Hah. Nyika plateau. 



Geortchtjs whttei, sp. n. 



Similar in size, character and colour of fur, and other external 

 charactei's to G. nimrodi, De Wint., more silvery bufE than G. Jiotten- 

 tottus. No trace of a white frontal spot. 



Skull heavy, particularly broad across the interorbital region, 

 and with strong, very widely expanded zygomata. Nasals narrow in 

 front, rapidly broadening to their middle, and then evenly narrowing 

 again to a point posteriorly. Ascending processes of premaxillse 

 considerably surpassing nasals, unusually broad posteriorly, 3 mm. 

 broad at the fronto-maxillary suture, and tending in old age to 

 unite behind the nasals. Anteorbital foramen-high. Other cranial 

 characters much as in G. hottentottus. 



Dimensions of type ( 5 ), in skin : — 



Head and body (stretched) 177 mm., hind foot (o.) 22. 



Skull — basilar length 32-6; greatest breadth 30 ; nasals 13-2 X 4 ; 

 interorbital breadth 11-2; palate-length from hensehon 23-2; 

 diastema 14. 



Hah. Karonga, Lake Nyasa {A, Whyte, July 1896). A Mole-rat, 

 apparently of the same species, was also found up to the extreme 

 top of the Nyika plateau. 



THEyONOMYS ' SCLATEUl, Sp. n. 



Most nearly related to T. gregorianus, Thos., of which the 

 external characters have not as yet been described. General colour 

 very much as in T. sivindereniamis, but the pelage, though more 

 hispid than ordinary fur, is much softer and more flaccid than in 

 the common form. Tail nearly twice the length of the hind foot. 

 Posterior belly and axillary region whitish. 



Skull rather smaller than the typical skull of T. gregorianus, 

 although decidedly older. Nasals parallel-sided. Frontal pre- 



^ Attention may be again drawn to the fact that Atdacodus, Temm. (1827), 

 ■was preoccupied by Eschscholz (1823), and therefore that the name Thryonomys, 

 Fitz. (1867), should stand for this genus. 



