which like Ochotona huangensis belongs to the subgenus Ochotona, was studied for a comparative karyotype analysis. The karyotype of Ochotona dauurica contains 50 chromosomes (NFa=68) which are grouped in 10 meta-submetacentric pairs (3 large, 2 medium and 5 small) and 14 subtelo- and acrocentric pairs of autosomes. The X chromosome is a submetacentric, similar in size to the 3-rd or 4-th pairs of autosomes, the Y chromosome is a very small acrocentric. The karyotype of the Daurian pika does not differ from that which was previously described in the literature.