Abstract: This paper describes the morphological difference of A.agrarius from different areas in eastern continental China. The author suggests that A.agraxius can be divided into two subspecies after the comparison ofclearnessof the black dorsal stripe and the colour of their dorsal hair. The two subspecies are: A.a.manchuricus and A.a .ningpoensis．A previously claimed subspecies -A.a.pallldior shows no distinctlve feature over the classification．Samples of A .p.palldior taken from north of Qinling Mountains to the Huai River line have similar dorsal coloration and black stripe with that of A .a.menchuricus,while samples taken from south of the above line have very similar dorsal coloration and black stripe with that of A.a.ningpoensis.
The diatribution of A.a.manchuricius and A.a.ningpoensis is demarcated along the Qinling Mountains to HuaiRiver line which is also the eastern boundary of the palaearctic Realm and Oriental Realm in China`s animal geographic division.

Key words: Striped field mouse(Apodemus agrarius), Zootaxozlomy, Subspecis

摘要： 本文研究了中国大陆东部地区黑线姬鼠的形态差异，根据鼠体背部黑线的清晰度和背部毛色以及某些外形性状的差异系数，提出中国东部地区黑线姬鼠可分为2个亚种，即东北亚种A.agrarhts.manchuicus和长江亚种A.a.ningpoensls.原华北亚种A.a.paIlidior从分类特征上看，其秦岭、淮河以北地区的应归入东北亚种，其南的应长江亚种。东北与长江亚种分界线大致与中国动物地理区期中的古北界和东洋界在我国东部的分界线相一致。

关键词: 黑线姬鼠, 动物分类, 亚种