145 



median length of nasals, 14; greatest breadth of both nasals, ^.75: 

 interorbital breadth, 17. 



Specimens examined. — Three from the type locality. 



Remarks. — An insular form someAvhat smaller than that occurring 

 on the adjacent mainland, and further characterised by slightly paler 

 and bluer colouration, slenderer rostrum and generally less robust skull. 



MUS (SURIFER) MICRODON, .<</). nor. 



Type. — Adult female (skin and skull), No. 2549/07, Selangor 

 Museum. Collected at Juara Bay, Tioman Island, 14th September, 

 1907, by E. Seimund. Original number 57. 



Characters. — Like Mas surifer but more tawny : centre of abdo- 

 men washed with buff-ochraceous ; a tawny band across chest and 

 white of under-parts not continued to hind-foot. Skull like that of 

 the mainland race but with longer nasals, lachrymal bones more 

 developed and palatal foramina larger. Molars greatly reduced in size. 



Colour. — Above ochraceous-tawny, plentifully sprinkled with a 

 black element which is strongest down the centre of the back, where it 

 forms almost a dark stripe expanding on the rump. Cheeks, sides of 

 neck, back of neck behind ears, shoulders, thighs and sides along the 

 line of demarcation almost clear tawny. Under-parts white except the 

 chest, which is crossed by a band of pale tawny about 18 m.m. wide, 

 and the fore and hind legs, which are completely encircled with the 

 same colour, extending almost to their junction with the trunk. Centre 

 of abdomen washed with clear buff (in some specimens deep ochrace- 

 ous). Upper surfaces of feet whitish. Tail bicolored with terminal 

 portion white. 



Skull and Teeth. — The skull does not differ consistently from 

 typical surifer except in tlie larger rostrum, broader palatal foramina 

 and inter-pterygoid space. The mandible is, however, less robust, and 

 the crowns of all the molars are much reduced, the last upper molar in 

 the insular animal being scarcely half the area of the same looth 

 in skulls of equal size from the Peninsula. 



Measurements. — Collector's external measurements of type : head 

 and body, 178; tail, 163; hind-foot, 38; ear, 25. Cranial measure- 

 ments of type : gi'eatest length, 45 ; l)asal length, 35.5 ; palatal length, 

 19.5 ; breadth between anterior molars, 4.75 ; length of palatal fora- 

 mina, 7; breadth of combined foramina, 4; diastema, 12.75; length 

 of molar-row, 6.5; length of nasals, 17.5; interorbital breadth. 7; 

 cranial breadth, 16. 



Measurements of an adult male from the type locality: (Sel. Mus. 

 No. 2551/07). Head and body, 180 (200)i ; tail. 190 (190) ; hind-foot, 

 40 (40) ; ear, 24. Cranial measurements : greatest length, 46.5 

 (46.5) ; palatal length. 21 (20.5) ; diastema, 13.5 (13.25) ; length of 



' Measurements in parentheses those of an arlnlt male, Sel. Mus. No. 249f) 07, 

 from the Sembroiig River, East Johore. 



