RESULTS FROM THE MAMMAL SURVEY. 425 



Callosciurus crum^n, sp. n. 



A Callosciurus of the erythraeus group, but differing from all 

 other members of it in having the nnderparts not red, but grizzled 

 more or less like the back. 



Size as in erythraeus. Fur soft and close, about 15-20 mm.. 

 long on the back. 



General colour above a grizzle of black and yellow, giving a 

 general olivaceous effect, finer on the flanks, coarser on the dorsal 

 area where also the yellow element in the grizzle becomes a bright 

 '' ochraceous." The individual hairs black, with three rings of 

 " ochraceous " or '•' ochraceous buff," the under fur " slate colour." 

 Below grizzled like the flanks, but still more finety, the lateral areas 

 of the abdomen more yellow than the median darkening posteriorly, 

 until the inguinal area is almost "hazel." Face in front of the 

 eyes " ferruginous." Feet finely grizzled. Tail grizzled like the 

 back, but more coarsely for three-fourths of its length, the remain- 

 der forming a black tassel. 



Skull as in enjthraeus. 



■Dimensions of the type: — Head and body, 205; tail, 193;. 

 hindfoot, 49 ; ear 20 mm. Skull : — Greatest length, 53 ; condylo- 

 basal length, 48.5 ; brain case breadth 24; interorbital breadth,. 

 19*5; nasals length, 16; cheek teeth, 11 ; diastema, 11* 5. 



Kahitat. — Sedonchen, Sikkim. 6,500 ft. 



Ty]je. — Adult male. B.M. No. 15.9.1.103. Original number,. 

 5785. Collected by Mr. 0. A. Crump, on the 17th November, 

 1914, and presented to the National Collection by the Bombay 

 Natural History Society. 



Mr. Crump obtained altogether eight specimens, all at the same 

 place, and he did not I understand see the species anywhere else. 



2. — A NEW Dremomts from Sikkim. 



In the Sikkim Collection, Mr. Crump obtained a series of 24- 

 specimens of Bremomys, 11 from the west, and 13 from the east of 

 the Tista River. On laying these out it was at once apparent that 

 there were present two distinct forms, the one from the west of an 

 olive colotii", strongly suffused with bright ochraceous, the other 

 from the west of a dark grey, almost black colouring. Each of 

 these series is remarkably constant in colouring, specimens from 

 places so close together as Lachen and Chuntang being as markedly 

 distinct as some from Sukiapokhri, on the Nepal border, from 

 others from the neighbourhood of the Jelap La on the Bhotan 

 frontier and nowhere is there any trace of " intergrading." Un- 

 fortunatety there is one specimen labelled " Sedonchen" which is 

 quite indistinguishable from west Sikkim specimens. Personally I 

 am of opinion that this is due to some unfortunate mistake irt 



