MAMMALS COLLECTED IN SIAM. 383 
Measurements. External measurements taken in the flesh :-— 
siamensis mordax — setifera 
Head and body... i 279 228 230* 
Tail = Be 246 230 195* 
Hind foot, s.u. ots ate 55 52 Gar 
Ear ; ans sks 31 31 a0" 
Skull :-— 
Greatest length ... aba 60 -— 59 
Condylo-basilar length ehe 55 55.8 54 
Basilar length... in 51.9 — 50.2 
Palatilar length ... ie 30.9 30.0 209 
Length of palatal foramina ... 11 EE 11 
Diastema ii FE 18.3 — List 
Nasals ... ve .. 22.9%7.0 210x68 20.9 x 6.0 
Interorbital breadth vas 8.0 7.4 8.7 
Breadth between ridges on 
parietals ce met 13.0 12.4 11.0 
Zygomatic breadth ne Be 30 — 
Upper tooth row, crowns... 9.0 10.8 9.2 
- - » alveoli be hes — Lid 
Breadth of m! Re 3.4 3.8 3.6 
Specumens examined. One, the type. 
Remarks. This animal seems to be closely allied to B. setifera 
and B. mordax. In addition to cranial and dental differences it 
seems to be rather larger than either, and darker in colour than 
setifera, while its undersurface is mouse-grey against the “slaty- 
grey” of mordaz. 
The specimen was trapped in the rice fields (where it lived 
in burrows) surrounding the village of Pak Bu near Tachin. 
43. Cannomys minor. 
Rhizomys minor, Gray, Ann. & Mag. Nat. Hist. X, p. 226 (1842); 
Bonhote, P. Z.S. 1900, p. 195; Gyldenstolpe, Arkiv for Zoologi. 
8, No 23, p. 19 (1914). 
Cannomys minor, Thomas, Ann, & Mag. Nat. Hist (8) XVI, 
p. S16,7 (1915). 
* from spirit specimen. 
VOL, III, No, 4; 1919, 
