MAMMALS FROM SI AM. 51 



nasals slightly more projecting anteriorlj^. In all except the 

 first of these characters tlie skull more nearly resembles E. j. pan 

 Robinson &l Kloss, from Koh Samui Id. of the opposite side of 

 the Gulf, but differs in the bulla?, which in that race agree with 

 E. j. biikit. 



Measarements. — Ear of type, 20 mm. For other measurements 

 see table, p. 72. 



/Specimens examined. — Twenty-bwo from Koh Chang and 

 twenty-three from Koh Kut. 



Remarks. — Besides externally closely resembling E. j, hukit, 

 this race is also very similar iu appearance to E. j. pan. While, 

 however, in the former the white of the under parts nearly 

 always reaches to the foot, in marinus it generally just fails to 

 do SO) and in the latter it always stops considerably short of the 

 ankle. 



Although these rats were exceedingly common on the two 

 islands none was met with on the mainland, so that I have had 

 to compare them with animals from the Malay Peninsula, which 

 Bonhote states (Fasciculi Malayenses, Zoology, part 1, p. 27) 

 exactly agree with those of Siam : in which case E. lepidibs 

 Miller, founded on a single adult individual from Southern 

 Tetiasserim (an intermediate locality), is also px'obably an example 

 of E.j. hukit. The position of this latter with regard to the 

 ti-ue E. jerdoni (Blyth) of Sikkim is not fully known, but from 

 the few details recorded of Darjiling specimens (Thomas, P. Z. S. 

 1881, p. 538; Blanfoi-d, Faun. Brit. India, Mammals, p. 411), 

 it would appear that the typical animal is a smaller form having 

 ii tail actually, and so relatively much, longer than bukit (and 

 therefore still longer than marinus). 



In my experience the jerdoni rat is by no means common in 

 the Malay Peninsula, and I failed to meet with it in S.E. Siam. 

 Of the small islands of these areas, E. j. pan had only recently 

 been discovered on Koh Samui, and I was therefore much 

 surprised to find a form occurring in great abundance on the 

 two larger islands of the Chantabun Archipelago, where it used 

 to come into my camp at twilight in seai^ch of food. 



The Koh Kut animals seem to be a trifle smaller than those 

 of the type-locality, but apart from that I can detect no difi'erenee 

 whatever. 



26. Epimys surifbr finis, subsp. n. 



Type. Aged male (skin and skull), No. 1885/O.B.K. B.M. 

 Ko. 15.11.4.117. Collected at Klong Menao, S.E. Siam, 11th 

 January, 1915. 



Characters. — Like Epimys siirifer Miller, from Peninsular Siam 

 (Trang), but duller ; white of under surface normally extending 

 to the ankle and over the bases of the vibrissee. 



Colour, — Upper surface ochraceous tawny, clouded on the back 

 by the dark tips of the flattened spines. Under parts white, 

 extending to the hind feet and to the roots of the vibrissse, but 



