Key to genera of Muridae in Korea

1 Head-body length> 250 mm; hind foot> 30 mm .......................................................... Rattus

- Head-body length <150 mm ............................................................................. 2

2 Tip of upper incisor notched from side view.............................................................. Mus

- Tip of upper incisor smooth without notch.................................................................. 3

3 Head-body length <75 mm; hind foot <20 mm ........................................................ Micromys

- Head-body length> 100 mm; hind feet> 20 mm ....................................................... Apodemus