Chlaenius, BONELLI, 1810

Kabak, I. I. & Liang, H. - B., 2021, An annotated list of the genus Chlaenius Bonelli, 1810 (Coleoptera: Carabidae) of Xinjiang Uygur Autonomous Region of China, Far Eastern Entomologist 429, pp. 12-28 : 24-25

Key to species and subspecies of the genus Chlaenius from Xinjiang

1. Ultimate palpomeres triangular, with numerous long setae ................................................. ............................................................ Ch. (Epomis) circumscriptus (Duftschmid, 1812)

– Ultimate palpomeres fusiform, glabrous or with sparse short setae ..................................... 2

2. Elytra glabrous, at most, sparsely pubescent on intervals 8-9 and near apex ...................... 3

– Elytra densely pubescent throughout .................................................................................... 4

3. Elytral intervals 8 and 9 yellow. Antenna and legs unicolored, yellowish ............................ ........................................................................ Ch. (Chlaenites) spoliatus (P. Rossi, 1796)

– Only elytral interval 9 yellow, Antenna and legs bicolored, scapus and tibia partly yellowish, antennomeres 2-11, femora and tarsi dark ........................................................................ ................................................................ Ch. (Chlaenites) inderiensis Motschulsky, 1850

4. Dorsal surface of tarsi densely pubescent; apical gonocoxite bifid ...................................... ................................................................. Ch. (Trichochlaenius) steveni (Quensel, 1806)

– Dorsal surface of tarsi glabrous or very sparsely pubescent; apical gonocoxite simple ....... 5

5. Labial penultimate palpomere, in addition to the apical setae, with two or more setae in the middle of inner side ....................... Ch. (s. str.) flavicornis Fischer von Waldheim, 1842

– Labial penultimate palpomere glabrous in the middle of inner side, only with apical setae ... ............................................................................................................................................ 6

6. Pronotum with a lateral seta located slightly distant from hind angle, pronotal surface markedly transversely rugose. Apical gonocoxite along outer margin with two spines ............ ................................................................... Ch. (Achlaenius) tristis tristis (Schaller, 1783)

– Pronotum with lateral seta located on hind angle, surface of the pronotum separately punctate or slightly rugose. Apical gonocoxite with four or more spines along outer margin .. ............................................................................................................................................ 7

7. Pronotum unevenly punctate: apical half very sparsely, basal half rather densely. Lateral margins of pronotum slightly convergent to the base. Palpi, antenna and legs completely black ................................................................. Ch. (Agostenus) alutaceus Gebler, 1829

– Pronotum evenly punctate; if sparsely punctate, its lateral margins distinctly convergent to the base. Palpomeres, antennomeres and legs at least partially yellow or brown, not completely black ....................................................................................................................... 8

8. Pronotum densely punctuate ................................................................................................ 9

– Pronotum sparsely punctate, with large smooth areas ........................................................ 12

9. Basal angles of pronotum rounded .................................................................................... 10

– Basal angles of pronotum more or less sharp ..................................................................... 11

10. Head and pronotum with blue luster, legs dark brown ...................................................... ............................................................ Ch. (Chlaeniellus) semenowi Tschitschérine, 1896

– Head and pronotum with green and/or coppery luster, legs, at least partly, pale ................... ............................................................... Ch. (Chlaeniellus) nigricornis (Fabricius, 1787)

11. Legs, at least partly, and antennomere 3 dark .................................................................... ................................................................... Ch. (Chlaeniellus) melampus Ménétriés, 1849

– Legs and antennomere 3 pale ................. Ch. (Chlaeniellus) chrysothorax Krynitzky, 1832

12. Elytral interval 9 and elytral apex yellow ........................................................................... ................................................................. Ch. (Chlaeniellus) extensus Mannerheim, 1825

– All elytral intervals black with slightly coppery luster, at most, margins of elytra yellow ..... ................................................................. Ch. (Chlaeniellus) tenuilimbatus Ballion, 1871