Key to genera of Cricetidae in Korea 1 Two lines of cusps on upper cheek teeth; length upper molar row 20% basal length skull........... 3 2 Dorsal pelage stripe absent; tail 50% of head-body length; head-body length> 150 mm ...................... Tscherskia - Narrow dark dorsal pelage stripe present; tail 30% of head-body length; head-body length 260 mm; tail vertically flattened.................................................... Ondatra - Head-body length 4 ridges lingual side........................................................... Microtus 6 Greatest length of skull 25mm; frontal bone has 2 ridges from parietal toward to nasal bone; tail dully bi-color.. Craseomys

Published as part of Jo, Yeong-Seok, Baccus, John T. & Koprowski, John L., 2018, Mammals of Korea: a review of their taxonomy, distribution and conservation status, pp. 1-216 in Zootaxa 4522 (1) on page 171, DOI: 10.11646/zootaxa.4522.1.1, http://zenodo.org/record/2610198