Paederus

Li, Xiao-Yan & Zhou, Hong-Zhang, 2009, A review of Chinese species of the subgenus Paederus s. str. (Coleoptera: Staphylinidae: Paederinae) with description of a new species, Zootaxa 2083, pp. 46-64 : 48

Key to species of the subgenus Paederus s. str. from China

1. Inner margin of mandibles with a bicuspidate tooth and behind it with a narrowly corneous notch (Figs. 1B, 3C, 5C, 6C)................................................................................................................................................................................. 2

- Inner margin of mandibles with two separated teeth and behind it with a broadly arched notch (Figs. 2C, 4B) ........ 5

2. Medial notch of labrum of male distinctly deep and distinct (Fig. 1A)........................... P. (s. str.) xinjiangensis sp. n.

- Medial notch of labrum of male very shallow or indistinct (Figs. 3A, 5A, 6A) .......................................................... 3

3. In lateral view, dorsal plate of aedeagus curved apically (Figs. 3L; 6L)...................................................................... 4

- In lateral view, dorsal plate of aedeagus not curved apically (Fig. 5L) ............................. P. (s. str.) socius Bernhauer

4. Both dorsal plate of median lobe and parameres with apex curved ventrally (Fig. 3L), internal armature with three thorns (Figs. 3N–O) ............................................................................................................. P. (s. str.) parallelus Weise

- Dorsal plate of median lobe curved dorsally but parameres with apex relatively straight (Fig. 6L), internal armature separated into two pieces, one of which exhibiting serrated interior margin (Fig. 6M) ..... P. (s. str.) sondaicus Fauvel

5. Body usually shorter than 7 mm, labrum with sides of median notch with two pairs of acute teeth (Fig. 2A) ............ ................................................................................................................................................. P. (s. str.) coxalis Fauvel

- Body usually longer than 8 mm. labrum with sides of median notch with one pair of round teeth (Fig. 4A)............... ........................................................................................................................................ P. (s. str.) pilifer Motschulsky