Abstract: 166 male David's vole (Eothenomys melanogaster melanogaster)was collected from Anxian county,Sichuan province during September,1990 to April,1991.all the male's bacular were made into transparent bacular specimens and the base height of proximal bacular process was used to divided it into 5 age group: Juvenil group:the base height was less than or equal to 0.38mm. Subadult group:the base height was more than 0.38mm,less than or equal to 0.53mm. adult groupⅠ:the base height was more than 0.53mm,less than or equal to 0.63mm. Adult groupⅡ:the base height was more than 0.63mm,less than or equal to 0.78mm. old group:the base height was more than 0.78mm. Variance analysis shows that the base height of proximal bacular process in 5 groups was different significantly(F-699.6,df=161).the differences inter 5 groups were significantly ,too. Throughvariance analysis,we found the body length,proximal bacular process length and base width of proximal bacular process of 5 groups were different remarkablly(body length,F=154.7,proximal bacular process length,F=73.2,base width,F=83.6,df=161)and the differences inter 5 groups were remarkablly too. So we think that using the base height of proximal bacular process to divide the age group of male David's vole was feasible and accurate.

Key words: Eothenonys melamgaster melanogaster, Bacula, Age group

摘要： 用雄性阴茎骨近支基底高作频数分配将黑腹绒鼠指名亚种划分为5个年龄组，对各年龄组的体长、阴茎骨近支长和阴茎骨近支基底宽作t检验和F检验均有显著差异或极显著差异．表明以阴茎骨近支基底高划分黑腹绒鼠年龄组是可行的。

关键词: 黑腹绒鼠, 阴茎骨, 年龄组