400 On the Squirrels classed under Sc. finlaysoni. 



Head and body 191 mm.; tail (c.) 190; hind foot 43 ; 

 ear 20. ' 



Skull : greatest length 49 ; basilar length 38 ; zygomatic 

 breadtli 30; brain-case breadth 22'6 ; interorbital breadth 18 ; 

 nasals, length 14, breadth proximally 4'3, breadth distally 7 ; 

 diastema 11 ; upper molar series 9"6. 



Ilah. Me Nam River (type from " below Pichit," alt. 117'). 



Type. Adult male. B.M. no. 3. 8. 5. 8. Original num- 

 ber 186. Collected June 8th, 1903, by Mr. T. H. Lyle, and 

 presented by him to the Museum. 



A series of eight specimens from various points on the 

 Me Nam from its junction with the Me Ping northwards to 

 Pitsanulok. Two or three of these specimens show, by an 

 increase of the all-white hairs scattered through the coat, an 

 approach to the next form, from the Me Ping. A series of 

 four individuals from a western feeder of the Me Nam all 

 show a similar moditication. 



(9) Sciurus hocourti dextralis, subsp. n. 



Size rather larger than either h. sinistralis or typical 

 hocourti. 



General colour above as in h. dextralis, but the proportion 

 of all-white hairs greatly increased (to almost one-half of tlie 

 whole) and the face more brightly coloured. Under surface 

 a dark shade of cinnamon-rufous approaching chestnut. 



Dimensions of the type (taken in the flesh) : — 



Head and body 206 mm. ; tail 184 ; hind foot 46 ; ear 20. 



Skull : greatest length 52 ; basilar length 41"5 ; zygo- 

 niatic breadth 30 ; brain-case breadth 24 ; interorbital 

 breadtli 18'3 ; nasals, length 16, breadth proximally 3"5, 

 breadth dislally 7*3 ; diastema 12 ; upper molar series 10'3. 



Ilab. Lower Me Ping Valley (type from Kampeng, 

 alt. 375'). 



Type. Adult female. B.M. no. 0. 10. 7. 9. Original 

 number 109. Taken 3rd Feb., 1900, by Mr. T. H. Lyle, 

 and presented by him to the Museum. 



A series of six specimens, from various points on the 

 Me Ping, from its junction with the Me Nam northwards to 

 Raheng, are, on the whole, fairly uniform, but one specimen 

 from liaheng approaches, by the almost complete substitution 

 of \\hite hairs (some of them black-tipped) for the usual black 

 with buff tips, to the following more northerly form. 



