Summary: | Studies of variations in some anteroconid measurements of M1 were made on three pairs of populations of Microtus arvalis (Pallas, 1779) (N=90) and M. agrestis (Linnaeus, 1761) (N=90). The LT4/LT5 index, is of little value as an independent taxonomic feature. However, the relationship between the length of Mand the LT4/LT5 index on a correlation diagram, makes it possible to distinguish these species with high probability. Studies of variations in some anteroconid measurements of M1 were made on three pairs of populations of Microtus arvalis (Pallas, 1779) (N=90) and M. agrestis (Linnaeus, 1761) (N=90). The LT4/LT5 index, is of little value as an independent taxonomic feature. However, the relationship between the length of Mand the LT4/LT5 index on a correlation diagram, makes it possible to distinguish these species with high probability.
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