112 ^Ir. O, Thomas on the Species of 



Dimensions of the tyj)e (measured in skin) : — 



Head and body 177 niillim. ; tail 112 ; liiud foot (wet) 

 (s. u.) ;V5 ; ear (wet) 2i). 



Skull : upper length from back of interparietal 42 ; zyo^o- 

 niatic breadth 22 ; nasals 16*5 X 4*3 ; interorbital breadth 6"5 ; 

 interparietal 5 X 10'5 ; palate length from henselion 20; 

 diastema 11*4; lenu:th of palatine foramina S"") ; length of 

 bulla 1 1 ; upper molar series 6 8. 



JIah. Lake Mwern. 



Tjlpe. ]\lale. B.M. no, 2. 1. 6. KJ. Presented by Com- 

 missioner Alfred Sharpe, CB. 



This gerbille was at first taken for a Gei-hilli'scus, but 

 further study convinces me that, like the T. vah'da of Angola, 

 it is a Tatcra with the incisive grooves shallower than in the 

 ordinary forms. From that species, of which the British 

 Museum contains a co-type, it is distinguishable by its still 

 l(;ss developed, indeed almost indistinguishable, incisive 

 grooves and the slaty bases to its belly-hairs. 



From GerhiUiscus fraterculusj which is entirely without 

 incisive grooves, and is perhaps a similarly retrogressively 

 specialized Talera, T. liodon differs by its much larger size 

 as well as by the structure of its incisors. 



LXVIII. — On the Species of ^ly^AM?, found in Borneo and 

 the Natuna Islands. By Oldfield Thomas. 



Besides the original Mydaus javanensis, Desm.* {}[. meli- 

 ceps^ F. Cuv.f, auct.), of Java, from which the Sumatrau 

 form cannot be distinguished, and the Palawan M. Marchei, 

 Huet (J/. Schadenhergi, Jent.), I find that tiiere are two 

 definable forms of the genus, occurring respectively in Borneo 

 and the Natuna Islands. The former is very distinct from 

 all, while the latter, curiously enough, is most closely allied 

 to M. juvanensis. 



Mydaus lucifer^ sp. n. 



Size large, the typical female skull decidedly larger than 

 any other female Mi/daus skull in the Museum coUoctiou. 



Fur thick and coarse, uniformly directed backwards 

 throughout; not reversed forward on tiie na[)e as in M.javan' 

 cnsis. Light marking very broad and conspicuous Oii the 



* Mejhitisjai'nmn^iK, Desm. Maiiiin. i. p. 187 HSl-'O). 

 t H. N. Mamiu. (lol.j ii. pi. clix. {W2\). 



