KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 2. 53 



In the Catalogue of the Ungulate Mammals in the British Museum Natural His- 

 tory vol. IV. 1915 p. 286 Tragulus ramis is included among the synonymns of Tr. kan- 

 chil afjinis and Thomas has suggested that the latter may perhaps be a southern type 

 in which case Tragulus ravus will ha ve to stånd for the northern form. 



Among the mammals recently obtained by my Dyak collector at the neighbourhood of 

 Teluk Anson, Perak, Malay Peninsula there is a fine male specimen, which has been identi- 

 fied as Tragulus ravus by Mr. C. Boden Kloss of the Federated Malay States Museums. 



When comparing the Siamese specimens with that one from Perak there are some 

 differences to be noticed. The general colouration of my specimen of Tragulus ravus 

 Mill. is much darker. 



The skulls also differ and I therefore believe that the southern form must be sepa- 

 rated under the name of Tragulus ravus. This stånds in opposition to what has been 

 stated by Thomas who considered Tragulus affinis as a more southern form than Tra- 

 gulus ravus. 



In this last-mentioned form the nasals are quite straight on their posterior börder, 

 while in the specimens from the northern parts of the Malay Peninsula they are rounded 

 as seen by the photograph (plate V fig.l.). The interorbital constriction is also narrower 

 the northern specimens and the bulla? are higher and broader than in my specimen of 

 Tragulus ravus. The occipital region is higher in the northern specimens and the palatal 

 width is less measuring 14,i mm. against 16,6 mm. in Tragulus ravus. (The specimens 

 compared are of about the same age though the Siamese specimen is perhaps slightly ol- 

 der, having its teeth more worn.) 



In his account of the »Mammals collected in Southeastern Siarn» Boden Kloss 

 comes to the conclusion that Tragulus kanchil affinis Gray has to be considered as a 

 more eastern form than Tragulus ravus, Miller. The former species is stated to inhabit 

 the Indo-Chinese countries while the latter is a Malayan form inhabiting the Malay Pen- 

 insula. In this I also agree with Boden Kloss but only to a certain degree. As seen 

 by the material at my disposal the Indo-Chinese form - thus Tragulus kanchil affinis, 

 Gray — also inhabits the most northern parts of the Malay Peninsula. The place where 

 this form meets the more southern form Tragulus ravus, Miller is still unknown, but it 

 may possibly be somewhere near the Isthmus of Kra. In the Siamese Province of Ban- 

 don, Robinson and Kloss met with typical T. ravus. 



Skull measurements T. le. af/inis T. ravus 



ef 



Greatest length 98,1 mm. 



Basal length 85,1 



Palatal length to posterior margin of foramiiia 



inciaiva 42,3 



Length of nasals mesially 26,5 



Breadth of nasals anteriorly 5,9 



Breadth of nasals posteriorly 15,0 



Zygomatic width 42,1) 



Maxillary toothrow 31,0 



Length of bullse 20,7 



Breadth of bulla? 8,3 



ef 



ef 



90,5 ram. 



95,0 ram 



77,5 



80,8 



37,2 



41.2 



23,5 * 



27,6 



6,1 



6,8 



13,5 



14,1 



39,5 



41,7 



32,6 



32,0 





19,3 » 



— 



9,0 » 



