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Klevezal G. A. & Fedyk A., 1978: Adhesion lines pattern as an indicator of age in voles. Acta theriol., 23, 27: 413—422 [With 1 Table & 5 Figs]. Examination was made of the bone structure of the mandible and the toe phalanges in three species of voles of known absolute age. In the case of individuals of Microtus agrestis living in summer it is possible to distinguish overwintered individuals from animals born in the given calendar year by the presence in the toe phalanges of adhesion lines of annual growth. On the basis of the structure of the mandible it is also possible to distinguish individuals born during the current year and, additionally, it also possible to establish to which seasonal generation voles in the second calendar year of their life belong. No annual growth adhesion lines were found in the toe phalanges of Clethrionomys glareolus and Pitymys subterraneus. The bone structure of the mandible in P. subterraneus made it possible to distinguish between overwintered adults and young individuals which had not lived through a winter. No adhesion lines were found in the mandible of C. glareo'.us. [Inst. Develop. Biology Acad. Sci. USSR, 117334 Moscow and Mammals