Averages of external and cranial measurements were correlated with latitudes in Apodemus peninsulae, A. draco, and A. latronum in East Asia and Siberia. A total of 852 sexually mature specimens of 24–44 local populations were grouped into 5–11 regions by countries, provinces of China, running directions of big rivers in south-western China and Myanmar, or islands. In A. peninsulae, significant positive correlations were demonstrated in the lengths of condylobasal (CBL), anterior part of the skull, diastema, head and body (HBL), and hind foot (HFL) in all regions except for Siberia, Sakhalin, and Hokkaido, whereas a negative one was in HBL in Siberia, indicating two clines with the largest at around 50°N in Heilongjiang, China. In A. draco, two significant negative correlations were shown in CBL, the lengths of anterior and posterior part of the skull, total molar, and tail by dividing into higher and lower localities than 29°N except for Hebei. In A. latronum, significant positive correlations were exhibited in CBL and HFL in all regions. Adaptive meanings of the latitudinal clinal variations disclosed in A. peninsulae and A. draco were discussed on plant productivity, character displacement, and increasing of the anterior part of the skull.
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Vol. 40 • No. 3