Abstract
The ectomorphology, maximum length of skull and teeth row length of 15 (♂9, ♀6) individuals of Sorex minutissimus collected in Sarobetsu of Northern Hokkaido in both 1997 and 1998 were compared with some known data. The present measurement values on the maximum length of skull and the hind foot length not including the claw were within the known data range. However, the some extremes of the ranges of the body weight, head and body, tail, fore foot , upper teeth row and lower teeth row length were outside the known data scope. The tail length under 34 mm and caliber under 2 mm of the maximum are useful as identification criteria of this species in Sorex.
