Dianous, Leach, 1819

Shuai, Qi & Tang, Liang, 2019, The genus Dianous in Zhejiang, East China (Coleoptera, Staphylinidae), Zootaxa 4706 (2), pp. 275-295 : 291-292

Key to Dianous species of Zhejiang

1 First segment of metatarsus distinctly longer than three following segments combined............................... 2 - First segment of metatarsus distinctly as long as or shorter than three following segments combined.................... 3 2 Elytra entirely dark blue.................................................................. D. coeruleotinctus - Elytra bicolored with large metallic area..................................................... D. coeruleovestitus

3 Elytra without reddish spots............................................................................. 4

- Elytra with reddish spots............................................................................... 6

4 Appendage distinctly longer, metatarsomere IV deeply bilobed..................................... D. zhejiangensis

- Appendage distinctly shorter, metatarsomere IV simple....................................................... 5

5 Legs reddish................................................................................ D. rufidulus

- Legs blackish............................................................................ D. rugosipennis

6 Head distinctly wider than elytra.................................................................... D. sp. 2

- Head distinctly narrower than elytra...................................................................... 9

7 Elytral spots very large, reaching the outsides of elytra..................................... D. banghaasi banghaasi

- Elytral spots different in size, separated from the outsides of elytra.............................................. 8

8 Setae of pronotum nearly invisible, diameter of elytral spots distinctly smaller than the length of antennamere 3.......... 9

- Setae of pronotum long and distinct, diameter of elytral spots slightly smaller to larger than the length of antennamere 3.. 10

9 Metatarsomere IV simple, legs blackish..................................................... D. luteostigmaticus

- Metatarsomere IV distinctly bilobed, legs more or less reddish............................................ D. freyi

10 Body length smaller than 4.9 mm, elytra with lateral sides slightly divergent.............................. D. aequalis

- Body length larger than 5.0 mm, elytra with lateral sides parallel............................................... 11

11 Setae of pronotum as long as antennomere 4, abdominal punctation larger, median lobe of aedeagus deeply bilobed at apex................................................................................................ D. sp. 1

- Setae of pronotum shorter than antennomere 4, abdominal punctation smaller, median lobe of aedeagus shallowly emarginated at apex...................................................................................... D. dubiosus