Styphlomerus, Chaudoir, 1876

Akhil, S. V. & Thomas, Sabu K., 2019, New Species of Bombardier Beetles of the Genus Styphlomerus Chaudoir, 1875 (Coleoptera: Carabidae) from Southern India, with a Key to the Indomalayan and Palearctic Species, The Coleopterists Bulletin 73 (2), pp. 465-471 : 466

KEY TO THE INDOMALAYAN AND PALEARCTIC SPECIES OF STYPHLOMERUS

1. Elytra with spots .................................... ................. S. bimaculatus Hrdlička, 2017

1 ʹ. Elytra without spots .............................. 2

2. Elytra with striations ( Fig. 2a ) ................ 3

2 ʹ. Elytra without striations ( Fig. 2b ) .............. ...................... S. ruficeps Chaudoir, 1876

3. Elytra striations well-impressed, deep ......... 4

3 ʹ. Elytral striations shallow, inconspicuous .......... 5

4. Pronotal median furrow very deep ............. ....................... S. korgei (Jedlicka, 1964)

4 ʹ. Pronotal median furrow shallow ................ ................... S. timorensis ( Jordan, 1864)

5. Head entirely black or anteriorly reddish brown and remainder black ( Fig. 2c ) ................... 6

5 ʹ. Head reddish yellow or reddish brown ( Fig. 2d ) .................................................... 8

6. Head anteriorly reddish brown, including mouthparts, and remainder black ( Fig. 2c ). .. ......................................................... 7

6 ʹ. Head entirely black ...... S. batesi Chaudoir, 1876

7. Elytra subparallel ( Fig. 2e ); pronotal hind angles at right angles, not projecting laterally ( Fig. 2g ) ........................... S. fusciceps ( Schmidt-Göbel, 1846)

7 ʹ. Elytra dilated towards apex ( Fig. 2f ); pronotal hind angles obtuse, projecting laterally ( Fig. 2h ) ................. S. fuscicollis Landin, 1955

8. Elytral humerus pronounced and projecting anteriorly ( Fig. 2j ), elytra dilated towards apex, bluish black; pronotal hind angles obtuse,

Figures

Fig. 2. Morphological features of Styphlomerus used in the key. a) Elytra with striations, b) Elytra without striations, c) Head black with anteriorly reddish brown, d) Head reddish brown, e) Elytra subparallel, f) Elytra dilated towards apex, g) Pronotal hind angles at right angles, without lateral projection, h) Pronotal hind angles obtuse, with lateral projection, i) Elytral humerus without anterior projection, j) Elytral humerus with anterior projection.