Key to known species of subgenus P. ( Paratachycines)

1 Small spine between the ventral apical spurs of for and mid tibiae present............ P. (P.) ussuriensis Storozhenko, 1990

- Small spines between the ventral apical spurs of fore and mid tibiae absent........................................ 2

2 Movable spurs of knee lobes of fore and mid femur long...................................................... 3

- Movable spurs of knee lobes of fore and mid femur very short, almost lacking............. P. (P.) parvus (Chopard, 1954)

3 Hind femur usually more than 14mm in length.............................................................. 4

- Hind femur usually less than 14 mm in length............................................................... 6

4 Pronotum with large reddish spot...................................... P. (P.) sadoensis Sugimoto et Ichikawa, 2003

- Pronotum without reddish spot, unicolorous................................................................ 5

5 Hind tibiae above with 73–76 spines on each side; spines of mid femur very long................................................................................................... P. (P.) maximus Sugimoto et Ichikawa, 2003

- Hind tibiae above with 66–71 spines on each side; spines of mid femur not so long............................................................................................... P. (P.) tsukubaensis Sugimoto et Ichikawa, 2003

6 Hind tibiae above with about 60 spines on each side; forest dweller.............................................. 7

- Hind tibiae above usually with 60 or more spines on each side; cave dweller...................................... 8

7 Pseudosternite of male genitalia almost rectangular....................... P. (P.) masaakii Sugimoto et Ichikawa, 2003

- Pseudosternite of male genitalia almost trapeziform.............................. P. (P.) hebeiensis Zhang et al., 2009

8 Body slightly larger............................................. P. (P.) saitamaensis Sugimoto et Ichikawa, 2003

- Body slightly smaller................................................. P. (P.) isensis Sugimoto et Ichikawa, 2003