384 MR. C. BODEN KLOSS ON 
Cannomys minor lonnbergi, Gyldenstolpe, Kungl. Sv. Vet. Akad. 
Handl., 57, No 2, p. 47 (1917). 
22 ad. Lat Bua Kao, E. Siam. Nos 2149, 2150. 
3 ad., lat. 14° 37’, long. 98° 30' Western Siam. Nos. 2533-5 
[Mr. A. J. Irwin] (Skins and skeletons.) 
1¢  subadult. North of Lakon Lampang, N. Siam. No. 2467. 
[Mr. P. A. R. Barron.] 
1 skin without skull, Me Chang, Lakon Lampang. No. 2468. 
[Mr. K. G. Gairdner] (hind foot in dried skin, 28.5: tail, 55.) 
No 2467 is younger than the others with the parietal ridges 
9-10 mm. apart; in the rest the greatest distance between these is 
4mm. at most (in No. 2535, the oldest): in none have the ridges 
joined to form a sagittal crest as in the obviously very aged ex- 
ample of badius figured by Anderson 1. 
The East Siam animals differ from the others in the follow- 
ing respects:—the fronto-parietal ridges are much more distinet, 
especially on the frontals, and are not pinched together posteriorly ; 
the sutures about the nasals, both median and lateral, are much 
more open (in No, 2533 they are nearly obliterated mesially) and 
the occiput makes a more acute angle with the floor of the skull. 
These slight differences do not seem sufficient to separate the 
specimens into races, especially as we do not know how they stand 
towards topotypes. 
Thomas examined some half dozen examples of the little 
Siamese bamboo-rat (including the type of minor), in connection 
with series of the other species or races from Burma, ete.,2 and pro- 
fessed himself unable to come to any satisfactory conclusion about 
the former, and for the present we all seem to be in the same posi- 
tion. He notes that all Cannomys (red bamboo-rats) “are of 
similar proportions and all, with one exception ( plimbescens of the 
North Shan States) have the coat washed terminally with some 
shade of rufous which may be brighter in some and deeper in others, 
but the difference is never beyond the range of individual variation. 
1 Anat’ & Zool. Res. pl. XVI. figs. 4, 5, 6. 
2 Op. cit. pp. 313-7 (1915) 
JOURN, NAT, HIST, SOC, SIAM, 
