hitherto classed tinder Sc. finlaysoni, Ilorsf. 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 hocourti. It 

 may Ije 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 

 up[)er Me Ping are found three forms which, though inter- 

 ffradincT with each other and to some extent with hocourti. 

 seem in those three localities to have attained a certain 

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

 described as subspecies. 



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

 arrange it : — 



Key. 



A. Unicoloured. 



a. All red. 



a". Feet black. (Pegu.) (1) fevrugineus, Ciiv. 



6\ Feet golden red. (Siam.) (2) cmnamomeus,Tiim\i\. 



b. All black. 



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



54. (Bangkok.) (.'>) nox, sp. n. 



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



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



c. All white. (Sichwan Island.) (5; Jinlaysoui, Horsf. 



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. 

 rt^. Belly white ; bullte parallel-sided. 



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



b^. Belly coloured ; subbasal white patch 

 on tail ; inner face of bullfe swollen. 

 a^ Grizzled brown and buff, with a 

 few aU-white hairs ; hind foot 

 43 mm. (Upper Me Nam Val- 

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



i^. Grizzled brown and buff, with 

 about half the hairs all white ; 

 hind foot 46 mm. (Lower Me 



Ping Valley.) (p) ^- dcxtralis, subsp. n. 



c~. Smoke-grey ; hind foot 49 mm. 



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



28* 



