SUPPLEMENT TO LIST OF MAMMALS IN THE TRANSVAAL 
MUSEUM, 
(Text fig. 12.) 
By Austin Roberts. 
In May, 1913, I made special excursions to the Rustenburg District for 
the purpose of obtaining specimens of a certain Clirysochloris, of which 
there are three specimens in the collection without skulls. The Chryso- 
chloris was not discovered, but a few Georychi were taken, one series 
apparently representing a species new to science. To this species I am 
applying the name of 
Georychus mcthali, spec. nov. (text fig. 12). 
Description : resembling the small reddish coloured species (No. 200 
in the List) found to the east of the Drakensberg ; but larger in size, as 
the following table will illustrate : — 
3 ad. $$ 
1 yg. ad. ($. 
1 juv. (3 mol, 
H. and B. 
135-142 
140 
120 
Tail 
17-23 
17 
21 
Hd. ft 
25-26 
23 
24 
In. cond. leng.... 
36 - 38 
36-5 
35 
Nas. cond. leng. 
... 32*7- 34 
33 
31*7 
Zyg. br 
... 24*1- 25-5 
24-3 
23 
Br. premax. 
6*4- 7 
6*2 
6-2 
Int. orb. br. 
7-3- 7-9 
7-5 
8-2 
Br. brain case ... 
... 14 - 15-5 
14*5 
14*5 
Nas. leng. 
... 12*1- 13 
13 
12 
Nas. br.... 
3 - 3-4 
3 
3-2 
Mol. ser. 
6*6- 7 
6-2 
— 
Diastema 
... 10*2- 10-7 
11 
9-5 
Br. incisors 
4*3- 4-9 
4*2 
4-2 
Br. molars 
6 
6 
6 
This species was first discovered at Bleskop, a small native village 
seven miles east of Rustenburg, four specimens being taken there, of 
which two were kept alive but unfortunately escaped a week later. It 
seems to be very locally distributed, for it was only observed at one other 
place along the railway line, namely at Rosslyn, some five miles N.W. 
of Pretoria North. At this last place it was found to be very abundant, 
and five specimens were taken, of which two very young ones were kept 
alive, but subsequently escaped. The type is an adult female taken from 
the three from Rosslyn, In none of the specimens are the teeth so worn 
down that the folds cannot be seen, and it is probable therefore that the 
very old ones are larger than the measurements given above ; but the 
nasals are so distinctly different from those of another larger species found 
[ 108 ] 
