MAMMALS FROM SIAM. 49 



Thomas, however, has recently reviewed the races of this 

 squirrel {loc. cii. sujyra) and, though one would, on geographical 

 grounds, place the present animals in the form tnouhotii, one can 

 also regard part of the series as of that subspecies as defined 

 by him and allot the remainder to his new race constdaris of 

 Northern vSiam. If we only knew the exact type-locality of 

 M. b. moioJiotii, given vaguely as Cambodia (Gray, loc. cit. supra)^ 

 we should probably find that these S.E. Siamese animals are 

 geographically, as they are in appearance, intermediate between 

 the two. 



Gray, who only had one specimen when describing tnouJwiii, 

 makes no mention of any dark stripes between the upper pale 

 ones, and consularis resembles his type in that respect. Thomas, 

 however, in extending the range of mouhotii from south of 

 Bangkok to Cochin-China, reports three inconspicuous black 

 stripes on the back between the upper pale ones as in herdmorei 

 herdmorei : mouhotii is white or whitish below, consularis 

 yellowish white. The series of 16 animals from S.I]. Siam have 

 backs ranging from thi-ee to no dark stripes and under surfaces 

 from white to yellowish white. 



The individuals from Eastern Siato (Koi^at) referred by 

 Gyldenstolpe {loc. cit, supru) to M, herdmorei require further 

 examination. 



Thus, exclusive of the two island races described below, the 

 following forms seem to inhabit our region : the true herd- 

 morei in Peninsular and perhaps Western Siam ; consularis in 

 Northern and perhaps Eastern Siam ; and mouhotii in South- 

 eastern Siam. 



The species seems to increase in size from west to east ; the 

 three forms mentioned here are all lai'ger than those fi'om Burma 

 and the Malay Peninsula,, and M. h. onoerescens from Annam 

 (Thomas, loc. cit. supra) is believed to be larger also. 



Measurevients. — Ears of the series, 18"5=-21 mm. For other 

 measurements see table, p. 7i. 



23. Menetes berdmorei umbrosus, subsp. n. 



Type. Adult female (skin and skull), No. 14J:9/C.B.K. 

 B.M. No. 15.11.4.97. Collected on Koh Chang Id., S.E. Siam, 

 8th December, 1914. 



Diagnosis. — Like M. 6. m,ouhotii from the adjacent mainland, 

 but darker above ; the three upper dark stripes very faintly 

 indicated by a blackish wash, the upper pale stripe narrower and 

 a deeper buff, the lower also deeper in tint but less distinct, 

 approaching in colour the outer side of the thighs ; the sides of 

 the abdomen between the limbs also darker. Under surface 

 somewhat more deeply bufly. Tail more ochraceous, blacker and 

 much less hoary. 



Skidl and Teeth. — As in the mainland animal. 



Measurements. — Ears of the type, 20, of the series, 17*5^ 

 20 mm. For other measurements see table, p. 71. 



Proc. Zool.. Soc— 1916, No. IV. 4 



