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

Published as part of 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, pp. 12-28 in Far Eastern Entomologist 429 on pages 24-25, DOI: 10.25221/fee.429.3, http://zenodo.org/record/7165884