530 GENERAL BIOLOGY 



Upper surface, if sculptured, not reticulate 26 



26. Metasternal groove broad and definite; length not 



over 1 5 mm. (10) Rhantus 



Metasternal groove narrow and indistinct (8) 



Colymibetes 



27. Prothorax with a narrow lateral raised margin (i) 



Eretes 

 Prothorax without such a margin 2C 



28. Spurs of hind 'tibiae acutely pointed at tip (4) 



Hydattcus 

 Spurs of hind tibiae emarginate at tip 29 



29. Elytra closely punctate (3) Acilius 



Elytra not punctate 30 



30. Middle femora beset with elongate setae (7) 



Thennonectes 

 Middle femora beset with short and stout setae (3) 



Graphoderes 



^■Wsi!Br0 





/' 



«» — ' 



.» \ 





Hydropcrus uadulatus. 



