OCHTHEBIUS. 139 



B B. Thorax shiny. 



a a. Thorax Avith two transverse impressions 

 on disc, without central furrow. 



Ovate. Head and thorax bronze; elytra light brown, 

 dull silky, or bronze-blackish ; under-side black, with gray 

 hairs ; legs rust-yellow. Vertex of head witli three depres- 

 sions ; thorax broad, nearly square, somewhat contracted 

 behind, the sides (especially behind) with a transparent, 

 whitish, membranous border, sometimes continued along 

 anterior and posterior margins, its surface flatly arched, 

 with a transverse impression and an impressed line on 

 each side of base ; elytra rather inflated, with fine punc- 

 tured striae. L. f 1. Eather common. 0. marinus, Payk. 



b b* Thorax without transverse impressions on 



disc, with central furrow, 



A a. Disc of thorax without impressions 



near central furrow. 



Ovate, flatly arched. Brown-bronze ; apex of elytra 



light pitch-brown ; under-side blackish ; legs rust-red. 



Thorax punctured throughout, with a central furrow and 



only some shallow impressions at side margin ; elytra with 



regular punctured striae, interstices not particularly raised. 



L. 1 1. Common. O.i^yymaeus, Fab. 



B b. Disc of thorax with two impressions 

 on each side near central furrow. 



Ovate. Eeddish-brown ; with metallic reflection, sides 

 usually lighter ; legs red. Thorax distinctly punctured, 

 with a central furrow and two pairs of depressions, side 

 margin Ijroadly separate, with an excision (filled with 

 a mem1)rane) behind ; elytra very convex, with strong 

 punctured striae, interstices somewhat raised. L. 1 1. 

 Common. 0. hicolon, Germ. 



II. Thorax pitch-black, with sides broadly red. 

 Broad. Pitch-black ; sides of thorax broadly red ; legs, 

 antennae and palpi red or reddish. Head feebly punc- 

 tured, with two or three depressions on vertex ; thorax 

 with a bent impression on each side near base; elytra con- 

 vex, with deep notched striae. L. |- — 1 1. Moderately 

 common. 0. rufimuryinatus, Steph. 



b. Thorax with transverse furrows prolonged to lateral 

 maru'in. 



