Key to species of Soronia from China based on males

1. Protibia simple (Fig. 29)................................................................................ 2

- Protibia bent abruptly (Figs. 27, 30)....................................................................... 4

2. Pronotum widest at basal 1/3, lateral margin arcuate; elytra with tubercles (Fig. 9)............ S. gratiosa Kirejtshuk, 1988

- Pronotum widest basally, lateral margin straight; elytra smooth (Figs. 5, 11)....................................... 3

3. Scape subtriangular; terminal antennomere rounded apically (Fig. 25); prosternal process truncate apically (Fig. 6); median lobe stout (Fig. 20)................................................................ S. magnipunctura sp. nov.

- Scape hemispherical; terminal antennomere pointed apically (Fig. 11); prosternal process rounded apically (Fig. 12); median lobe slender (Fig. 18).............................................................. S. grisea (Linnaeus, 1758)

4. Pronotum obviously wider than elytra..................................... S. shibatai Hisamatsu & Hisamatsu, 2008

- Pronotum narrower than elytra (Figs. 1, 7)................................................................. 5

5. Body small, <6 mm long............................................................................... 6

- Body large,> 6 mm long................................................................................ 7

6. Inner margin of mesotibia strongly arched (Fig. 1)............................................. S. expansa sp. nov.

- Inner margin of mesotibia moderately arched (Fig. 8)..................................... S. xiangxiyuanica sp. nov.

7. Protibia with outer apical angle nearly right; tegmen truncate apically...................... S. laevigata Kirejtshuk, 1984

- Protibia with outer apical angle blunt; tegmen broadly rounded apically.......................................... 8

8. Body slender; dorsal surface with indistinct tubercles; protibia narrow in proximal 3/5, strongly widened and curved at distal 2/5............................................................................. S. merkli Kirejtshuk, 2005

- Body stout; dorsal surface prominently tuberculate; protibia widened at inner margin of distal 2/5.... S. fracta Reitter, 1884