lIYDROrOKUS. 105 



base black. Sides of tliorax rounded, angle at junction 

 with elytra moderate. L. 2 1. Moderately common. 



H. assimilis, Payk. 



JB b. Angle at junction of sides of thorax 

 and elytra inconspicuous. 

 A i. Sides of thorax rounded; under- 

 side deeply and coarsely punctured. 

 Head and thorax reddisli-yellow, latter with two dark 

 spots on disc ; elytra gray-yellow, with suture and five or 

 six lines on each (reaching neitlier base nor apex) V)lack, 

 outer lines usually much interrupted, inner connected here 

 and there. Body finely pubescent. L. 2 1. Moderately 

 common. H. halensis, Fab. 



S 1. Sides of tliorax nearly straight ; 

 under-side very finely punctured. 

 Eeddish-yellow ; thorax with anterior and posterior 

 margins, two spots on disc and usually also a smaller spot 

 black ; elytra witii suture and seven lines on each black, 

 first line narrower than the rest, sixth and seventh some- 

 times interrupted, slightly hairy. L. 2| 1. Not very com- 

 mon, i^- griscostriatus, l)e G. 



b b. Elytra black or blackish, with lighter 

 side margin. 



A a. Sides of thorax lighter than disc. 

 A 1, Thorax with a transverse impression 

 on hinder half. 

 Head brown-red; thorax black, sides and interrupted 

 transverse band brown-red; elytra brown-black, with a 

 broad curved red-brown border and usually also a red 

 transverse Ixind near base, pubescent. Punctuation strong. 

 L. 2A 1. Moderately conmion. H. dort^alis, Fab. 



JB 1, Thorax without the transverse im- 

 pression. 



a 1. Disc of tliorax nearly or quite 

 impuuctate. 



A 2. Thorax blackish, sides brown- 

 red. 



a 2, Elytra gradually narrowed 

 after the first third part of the 

 lenfjth. 



