140 I'ALPICOKNIA IIYDROPIIILIUAE. 



Head and thorax brown-Llack, shiny, deeply furrowed ; 

 former with two frontal depressions, united behind l)y a 

 transverse furrow, latter with two transverse furrows, 

 scarcely interrupted at sides of disc and prolonged to lateral 

 margins, united by a feeble central furrow and crossed by 

 the two post-ocular furrows ; elytra reddish-brown, with 

 tolerably deep, almost square punctures. L. -^ 1. Not 

 uncommon. 0. cxaratus, Muls. 



13. Elytra with feeble punctured striae. 



(i» Elytra mucli dilated ; length 1 line. 



Pitchy-bronze, shining ; elytra paler ; antennae and legs 

 pitchy-red. Thorax with sides dilated and a deep punc- 

 tured depression toward anterior angle ; elytra consideraljly 

 dilated, with feeble punctured striae. Not common. 



0. aeneus, Steph. 



b. Elytra not much dilated ; length f line. 



Bright coppery-bronze; legs red-yellow; antennae and 

 palpi pale, darker at apex. Vertex of head rough, watli 

 three depressions ; thorax smooth, with several depressions 

 on each side of central furrow, margin Hat, with a depres- 

 sion in front ; elytra with obscure punctured striae. 

 L. I 1. Rather common. 0. acratiis, Steph. 



C. Elytra confusedly punctured. 



Rather elongate. Shiny bronze, pubescent ; anterior 

 and posterior margins of thorax whitish ; legs, antennae 

 and palpi red-yellow, apex of latter and tlie tarsi dark. 

 Vertex of head, witli two deep depressions ; thorax with a 

 central furrow and four impressions on eacli side, the two 

 Literal ones couuected by an arched stria ; elytra minutely 

 punctured, without striae. L. 1^- 1. Rather common. 



0. punctatus, Steph. 



Jlt/draena, 



A, Metasternum with three raised lines, the middle one 

 forked behind. 



Head black, tliorax and elytra l)rownis]i-yellow, under- 

 side blacl<. Thorax as long as broad, slightly curved at 

 sides, longitudinal impressions feeble, punctuation strong, 

 with an irregular transverse furrow before apex ; elytra 



