hitherto classed under Sc. finlaysoni, Ilorsf. 399 



(7) Sciurus bocourti, A. M.-Edw. 



L867. Sciurus bocourti, A. M.-Edwards, Rev. Zool. p. 193. 

 I 367, Sciurus leucogaster, A. M.-Edwards, Rev. Zool. p. 196. 

 1901. Sciurus leucocephalus, Boiihote, P. Z. S. p. 54. 



The type-locality of 8. bocourti was Ayuthia, on the river 

 north of Bangkok. 8. leucogaster came from " Pexabury, 

 close to Bangkok, and is evidently a young individual of this 

 species. The Museum has a long series from Ayuthia, collected 

 by Capt. S. S. Flower, and others from various points on the 

 river still farther north, and some from the Me Nam feed< r 

 as far north as Pichit, collected by Mr. T. H. Lyle, 

 beyond which point it is replaced by the next form. It is a 

 form which varies extraordinarily in colouring. Milne- 

 Edwards gives the ground-colour as " un fauve roux et 

 noiratre"; in a series of over twenty specimens I tind all 

 grades of colour, from almost black, through "seal-brown" 

 and " chocolate," to a quite pale " smoke-grey," in all cases 

 grizzled with pale buff. The under surface is white, but in 

 certain individuals this extends to the feet, in others to the 

 face and head also, and in yet others the tail has become 

 white. Finally, in the series from Ayuthia are two abnormal 

 individuals in which white is entirely absent, even the belly 

 is chestnut. These specimens approach the form next 

 described, except for the absence of the subbasal pale spot on 

 the tail which so constantly characterizes the latter. 



Dimensions of an adult male : — 



Head and body 192 mm. ; tail 198; hind foot 45 ; ear 20. 



Skull : greatest length 50 ; basilar length 39 ; zygomatic 

 breadth 31 ; brain-case breadth 23 ; interorbital breadth 18*5; 

 nasals, length 15, breadth proximally 3*5, breadth distally 7*7 ; 

 diastema 11*2 ; upper molar series 10'5. 



(8) Sciurus bocourti sinis trails, subsp. n. 



Slightly smaller than typical bocourti. 



General colour above black or " clove-brown," grizzled 

 (finely) with buff, with a certain number of all-white hairs 

 sprinkled over the back. Face, including the ears, suffused 

 with bright " hazel." Under surface near "hazel"; hands 

 and feet dark, almost black. Tail for a short distance 

 (30 mm.) coloured like back, then for some distance (45 mm.) 

 almost white (the hairs white, with black tips), the rest of 

 the tail bright " bay," an obsolescent black and buff barring 

 still traceable at the bases of the hairs. 



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



