Chernyavskii F.B., Kartavtseva I.V.
Zoologicheskiy zhurnal 1999; 78(10): 1237-1244
The new data on morphology and karyology of the Lemmus population from the Kolyma Lowland are presented, A female karyotype got form crossing of female from the lower Kolyma River (left bank) and male from the vicinity of the town of Anadyr are described, Lemmus sibiricus Kerr, 1792 was found to inhabit the Kolyma Lowland, The Kolyma River and the uplands on its right bank are boundaries between the investigated species and the range of L. trimucronatus Richardson, 1825 (=L. chryogaster, J, Alien, 1903).
