Discussion
As shown in table [1], there are ten characters by means of which Eutamias and Tamias can be separated consistently. The subgenus Eutamias occurs on the Asiatic side and the subgenus Neotamias occurs on the North American side of Bering Strait, yet the two subgenera agree in the ten features referred to. Although the subgenus Neotamias and the genus Tamias occur together in parts of the United States and Canada, they differ in the ten features, indicating that the subgenera Eutamias and Neotamias are more closely related to each other than either is to Tamias.