Chlaenius

Chanu, N. Yaiphabi & Swaminathan, R., 2017, Notes on species of the genus Chlaenius Bonelli, 1810 (Coleoptera: Carabidae, Chlaeniini) from four agro-climatic zones of Rajasthan, with description of two new species, Zootaxa 4237 (3), pp. 545-566 : 546

Key to species of the genus Chlaenius from Rajasthan

1 Elytra with distinct longitudinal band at lateral side from base to apex, or with fascia or spots.........................2

- Elytra without distinct longitudinal band or fascia or spots....................................................10

2 Elytra with distinct longitudinal band without spots or fasciae..................................................3

- Elytra often with distinct longitudinal band; with either fasciae, spots or both..................................... 4

3 Pronotum coarsely punctate and pubescent; elytral intervals densely punctate pubescent; median tooth of mentum rectangular with rounded angles; apical lamella of aedeagus ventrally hooked.................................... C. laevipennis

- Pronotum glabrous, sparsely punctate; elytral intervals almost smooth with microsculpture and a row of setiferous punctures on either side; median tooth of mentum bifid; lamella of aedeagus sub-truncate at apex.................... C. nitidicollis

4 Elytra with distinct yellow fasciae or patterns...............................................................5

- Elytra without fasciae; only distinct yellow/testaceous spots present.............................................. 6

5 Elytral fasciae comma shaped, present at 1/3rd from apex and extending from 3rd to 8th intervals, and reaching apex; pronotum green coloured; lamella of aedeagus rounded at apex, median lobe expanded laterally on left side.............. C. hamifer

- Elytra with yellow band bordering laterally, extending from base to apex, fasciae at humeral angle apart from middle and apex; apical lamella of aedeagus bifurcated............................................................ C. scapularis

6 Testaceous spot close to apical region of elytron extended across the suture though intervals 1–3........... C. malachinus

- Testaceous spot not extended across the suture, covering intervals 3 to 7 or 8......................................7

7 Elytra turquoise blue; male last segment of maxillary palpi diamond shaped.............................. C. orbicollis

- Elytra black; male last segment of maxillary palpi coniform/sub-cylindrical.......................................8

8 Pronotum ovoid, uniformly and coarsely punctate............................................................9

- Pronotum quadrate, basal margin wider than anterior; punctures not uniform, more dense on basal region; aedeagus stout, api- cal lamella small and rounded at apex............................................................. C. posticus

9 Body length ranging from 13–14 mm, both pronotum apical and basal angles rounded; spot on elytra wavy; aedeagus stout, lamella rounded at apex......................................................................... C. distigma

- Body length less than 13–14 mm, pronotum apical angle rounded, basal angle obtuse but not sharp, spot on elytra almost rounded; aedeagus slender, lamella truncate at apex....................................... .. C. udaipurensis sp. nov.

10 Labrum emarginate................................................................................... 11

- Labrum either truncate or very slightly emarginate..........................................................12

11 Labrum deeply emarginate; a row of punctures on either side of striae on elytra, elytra black with greenish tinge; median lobe of aedeagus dilated, apical lamella elongate....................................................... C. chlorodius

- Labrum emarginate; elytral intervals smooth with few punctures showing sparse and short pubescence; elytra blue; median lobe of aedeagus not dilated, length of apical portion short............................................ C. pretiosus

12 Third antennomere longer than 1st and 2nd combined; mentum bifid; pronotum glabrous green with very few punctures; aedea- gus stout, lamella sub-truncate at apex.......................................................... C. quadricolor

- Third antennomere shorter than 1st and 2nd combined.........................................................13

13 Pronotum shiny green, lateral margin brown, irregularly punctate and pubescent,; aedeagus slender........... .. C. velocipes

- Pronotum dull, confluently punctate with wrinkles, sparse pubescence more dense at basal region, black coloured with green- ish tinge; aedeagus stout, almost cylindrical............................................... C. pseudotristis sp. nov.