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6. Punctulate. Head above convex . . . Sericosomus 

 Densely tiansversally rugose. Head flattened above 

 Ludius 



7. 9*'' abdominal segment flattened above . . Melanotns 

 9*'' abdominal segment conical with cylindrical base 8. 



8. Faintly punctulate and rugose 9. 



Coarsely punctated 11. 



9. 9"^ abdominal segment with 3 transversal rows of 

 large prominent setiferous tubercles . . . Dolopius 

 9"' abdominal segment without such tubercles . . 10. 



10. 9*'' abdominal segment on each side with a large 

 dark eye -shaped muscular impression . . . Agriotes 

 9*^> abdominal segment without any eye-shaped 

 muscular impression Ectinus 



11. Anal tube situated under the last third of 9**^ ab- 

 dominal segment Megapenthes 



Anal tube situated under the first third of 9*'' ab- 

 dominal segment 12. 



12. 9*'' abdominal segment conically pointed just from 

 the base, with transversal rows of large setiferous 



tubercles Ischnodes 



9*^ abdominal segment cylindrical at the base, 

 without tubercles Elater 



13. Each cerce simply inwards-bending 14. 



Each cerce ends in 2 prongs 15. 



14. 9*'' abdominal segment with a slight roundish me- 

 dian impression Pheletes 



9*^^ abdominal segment without any median im- 

 pression Limonius 



15. 9"' abdominal segment straightly continuing in the 

 inner prong of the cerce as a principal branch; 

 outer prong fainter, sitting as a little accessory 



branch on the inner one Hypnoidus 



The 2 prongs rather equal or outer prong must 



be regarded as the principal branch 16. 



16. 9»'' abdominal segment with a sagittal median 

 furrow .17. 



