Euleptarthrus

Wu, Jie & Zhou, Hong-Zhang, 2013, Taxonomy of the subgenus Euleptarthrus Jakobson (Coleoptera, Staphylinidae, Osoriinae, Priochirus) of China with descriptions of three new species, Zootaxa 3613 (2), pp. 165-175 : 167

Key to Chinese species of the subgenus Euleptarthrus

1. Head with outer lateral teeth strongly projecting and sharp, about twice as long as inner lateral teeth........ P. (E.) oxygonus

- Head with outer lateral teeth rounded or bluntly pointed, nearly as long as inner lateral teeth......................... 2.

2. Head with outer and inner lateral teeth distinctly pointed; lateral setae on clypeus absent; 3rd ventral tooth of mandible dis- tinctly pointed and together with 1st and 2nd ventral teeth forming trifurcate structure.............. · P. (E.) trifurcus sp. nov.

- Head with outer lateral teeth rounded, inner lateral teeth at most triangular or bluntly convex; two pairs of lateral setae on clypeus present; 3rd ventral tooth of mandible absent, or if present never forming trifurcate structure with 1st and 2nd ventral teeth............................................................................................... ·3.

3. Pronotum red or dark red.............................................................................. 4.

- Pronotum black or brown.............................................................................. 5.

4. Elytra red; pronotum without lateral puncture on each side of median longitudinal sulcus.............. P. (E.) baoxingensis

- Elytra black; pronotum with small lateral puncture on each side of median longitudinal sulcus............. P. (E.) elongatus

5. Elytra with disc glossy and only marginal area covered with coriaceous ground sculpture............... P. (E.) parvicornis

- Elytra completely covered with distinct coriaceous ground sculpture............................................ 6.

6. First dorsal tooth of mandible shorter than 1st and 2nd ventral teeth, 2nd dorsal tooth absent............................ 7.

- First dorsal tooth of mandible longer than 1st and 2nd ventral teeth, 2nd dorsal tooth present........................... 8.

7. Inner lateral teeth on head triangularly convex; elytra dark red............................. P. (E.) deltodontus sp. nov.

- Inner lateral teeth on head bluntly convex; elytra dark brown................................... P. (E.) amblyodontus

8. Third segment of antennae about 3 times as long as 2nd; inner lateral teeth on head curtate; inclined plane between lateral teeth and clypeus visible from above..................................................... P. (E.) curtidentatus sp. nov.

- Third segment of antennae at most 2.5 times as long as 2nd; inclined plane between lateral teeth and clypeus invisible from above.............................................................................................. 9.

9. Body brown; size smaller (<10 mm); frontal impression distinctly narrowed frontad............... P. (E.) subbrevicornis

- Body black; size larger (> 12 mm); frontal impression slightly divergent frontad........................ P. (E.) chinensis