Key to species (males) of Chionea from Eastpalaearctic

1 Antenna with 11 segments; sclerotized lobe of gonostylus truncated apically (Vanin 2008, 2010)............................................................................................ C. (C.) kanenoi Sasakawa, 1986 (Japan)

- Antenna with less than 11 segments; sclerotized lobe of gonostylus bidentate...................................... 2

2 Tibiae enlarged and bulgy rounded at tarsal articulations...................................................... 3

- Tibiae not bulgy rounded at tarsal articulation............................................................... 4

3 Posterior margin of tergite 9 concave medially (Fig. 27); paramere apically acute and curved downward (Figs. 26, 30)............................................................................... C. (C.) sphaerae sp. nov. (China)

- Posterior margin of tergite 9 linear; paramere apically rounded and internally folded (Vanin 2008)....................................................................................... C. (C.) mirabilis Vanin, 2008 (South Korea)

4 Aedeagus large, projecting beyond paramere............................................................... 5

- Aedeagus small, not projecting beyond paramere............................................................ 8

5 Antenna with 9–10 segments (Alexander 1932)...................... C. (C.) nipponica Alexander, 1932 (Russia; Japan)

- Antenna with 5–7 segments............................................................. C. (C.) crassipes ... 6

6 Claspette of aedeagal complex with one long hair and few fine, short hairs (Narchuk 1998)................................................................................... C. (C.) crassipes magadanensis Narchuk, 1998 (Russia)

- Claspette of aedeagal complex only with few fine, short hairs,without long hair.................................. 7

7 Inner tooth of sclerotized lobe of gonostylus shorter than outer tooth (Fig. 9); paramere with tip wide and blunt (Fig. 7, 11).......................... C. (C.) crassipes gracilistyla Alexander, 1936 (Russia; North Korea; South Korea; Japan; China)

- Inner tooth of sclerotized lobe of gonostylus as long as outer tooth; paramere with tip strongly narrowed (Narchuk 1998)......................................... C. (C.) crassipes crassipes Boheman, 1846 (Finland; Norway; Sweden; Russia)

8 Inner tooth of sclerotized lobe of gonostylus shorter than outer tooth (Fig. 17); paramere and claspette with tips rounded; aedeagus with two goblet-shaped lobes at base (Figs. 15, 19)................. C. (C.) pusilla Savchenko (Russia; China)

- Inner tooth of sclerotized lobe of gonostylus as long as outer tooth (Fig. 36); paramere and claspette with tips relatively acute; aedeagus with a rounded lobe covering it (Figs. 34, 38)......................... C. (C.) tianhuashana sp. nov. (China)