hitherto classed under Sc. finlaysoni, Ilorsj. 395 



The first of these, extending the whole way along the main 

 stream and a short way along the eastern tributary, has 

 already received from Milne-Edwards the name boeourti. It 

 may be described broadly as grizzled above, pure white 

 below, with a greyish-brown tail obscurely barred with ferru- 

 ginous ; but in a series of twenty specimens the only constant 

 character is a white belly (and even this is replaced by a red- 

 brown one in two other specimens) ; the dorsal ground- 

 colour varies from almost black, through brown, to a pale 

 grey, and the white of the lower surface extends in a varying 

 degree to the head, the feet, the tail, and even partially to 

 the back. Higher up the Me Nam and on the lower and 

 upper Me Ping are found three forms which, though inter- 

 grading with each other and to some extent with boeourti, 

 seem in those three localities to have attained a certain 

 modified fixity, and are, in my opinion, worthy of being 

 described as subspecies. 



The following is a key to the group as I now propose to 

 arrange it : — 



Key. 



A. Unicoloured. 



a. All red. 



a 1 . Feet black. (Pegu.) (1 ) ferrur/ineus, Gov. 



b l . Feet golden red. (Siam.) (2) cinnamomem, Temm. 



b. All black. 



«'. Size large: hind foot 51 mm.; skull 



54. (Bangkok.) (-3) nox, sp. n. 



b\ Size small : hind foot 42 mm. ; skull 



47. (Pulo Condor.) (4) germani, M.-Edw. 



c. All white. (Sichwan Island.) (5; jlnlaysoni, Hoist'. 



B. Parti-coloured. 



a. Hind foot 53 mm. ; tail with no red 



colouring. (Phu Kok.) (6) harmandi, M.-Edw. 



b. Hind foot at most 49 mm. ; distal § of 



tail maroon or bay. 

 a 1 . Belly white; bullec parallel-sided. 



(Bangkok River.) (7) boeourti, M.-Edw. 



b 1 . Belly coloured ; subbasal white patch 

 on tail ; iuuer face of bulla? swollen. 

 a 2 . Grizzled brown and buff, with a 

 few all-white hairs ; hind foot 

 43 mm. (Upper Me Nam Val- 

 ley.) (8) b. sinistralis, subsp. n. 



b 2 . Grizzled brown and buff, with 

 about half the hairs all white; 

 hind foot 46 mm. (Lower -AI>: 



Ping Valley.) (9) b. dextralis, subsp. n. 



c\ Smoke-grey; hind foot 49 mm. 



(Chiengmai.) (10) b. lylei, subsp. n. 



28* 



