7\eio Mammals from the Malaj Peninsula. 220 



specimens known are the types from tlie valley oE the 

 Sittang, Lower Pegu, over 500 miles distant. Amongst 

 local forms it is readily distinguished from E. cremuriventer 

 by its greater size and bicolor tail, not strongly penicillate at 

 the tip, and from E.jerdoni bnkit by longer less markedly 

 bicolor tail, and by its richer colouring. It agrees with both 

 and diflfers from all the other local forms in the areeuish- 

 grey bases of the dorsal spines. 



Epimys jerdoni pan, subsp. n. 



Type. — Adnlt male Cskin and skull), No. 80/13, Fede- 

 rated Malay States Museum, collected on the hills of Koh 

 Samui, N.E. Malay Peninsula, 15th May, 1913, by 11. C. 

 Robinson and E. Seimund. Original no. 5351. 



Characters. — A spiny rat of the jerdoni group, with bi- 

 color tail, considerably exceeding head and body in length, 

 but relatively shorter than that of the mainland form. 



Colour. — Above mingled ochreous buff and dark brown, 

 the former predominating on the sides of the head and 

 neck, below pure buffy white, sharply defined from the sides; 

 liands and feet whitish, the median areas brownish. Bases 

 of the spines greenish grey. 



Skull and teeth. — Not differing materially from those of 

 E. j. bukit *, but with the anterior margin of the meso- 

 pterygoid space more abruptly truncate, less rounded ; 

 rostrum somewhat heavier, atid nasals longer. 



Measurements. — Collectors' external measurements (taken 

 in the fle-h) : — 



Head and body 149 (158 f) mm.; tail 174 (192) ; hind 

 foot 27-5 (30-0). 



Cranial measurements : greatest length 37*7 (37'0) ; con- 

 dylo-basilar length 315 (Sl'O) ; pahitilar length IG'O (15-0}; 

 length of nasals 14*7 (13"0); greatest breadth of combined 

 nasals 4*4 (4*6) : shorte^st distance between tips of nasals 

 and lachrymal notch 14*2 (13*8) ; diastema 10*0 (9*4); 

 upper molar ix)w 5*0 (5*9j ; length of palatal foramina G"4 

 (<i"3j ; breadth of combined foramina 2*9 (27) ; zygomatic 

 breadth 17*0 (16-9); cranial breadth 14*6 (15*0). 



Specimens examined. — Five, all from the type-locality. 



Remarks. — This form is somewhat closely allied to the 

 mainland E.jerdoni bukit, but the differences, whicii seem 

 constant, are sufficient to separate it as an insular race. 



* Runhote, .\nn. & Mag-. Xat. Hist. (7) xi. p. 125 (lOO.'J). 



t Mt'dsurements iu parentheses are thuse of au adult ii;ale E. jerdoni 

 bukit from Clinng, Trauy, Western Siaiuesj .Malay .States; rederated 

 Malay Stute.s Museum, No. 30/10. 



Ann. ii- Ma./. X. Hist. i^rv. 8. Vol. xiii. IG 



