Genus Platysoma Leach, 1817
Key to the Korean species of the genus Platysoma
1 (6) Body oblong-oval. Body as wide as length of sutural line of elytra. .......................................................... Subgenus Platysoma Leach
2 (3) Body length 4.2 - 5.3 mm; prosternal process with carinal striae; lateral pronotal stria rather distant from the side margin. ................... P. (P.) lewisi Marseul, 1873
3 (2) Body length 2.13 - 3.8 mm; prosternal process without carinal striae; lateral pronotal stria rather close to the margin.
4 (5) Dorsal striae 1 - 4 complete. ............ P. (P.) deplanatum (Gyllenhal, 1808)
5 (4) Dorsal striae 1 - 3 complete. ........................ P. (P.) rasile Lewis, 1884
6 (1) Body slender and narrower than length of sutural line of elytra. .................................................................... Subgenus Cylistrix Marseul
................................................................. C. lineicollis Marseul, 1873