60 COLEOPTERA. 



disco sat corivexo, nitido ; dorso foveis duabus parallelis, 

 profundis, basi latioribus, pariim nitidis, rugoso-punctatis, 

 antice foveola tertia intermedia obsoletiore angustiore divisis, 

 et antice utrinque fossula oblonga, profunda, sub-laterali im- 

 pressus; spatio utrinque angulis posticis coniini alutaceo, 

 sat depresso, vix punctulato. 



Scutellum alutaceum. 



Elytra thorace plus quam duplo longiora ; humeris vix 

 prominulis ; angulis externis posticis oblique rotundato- 

 truncatis; sat crebre et profunde punctata, rugulis confiu- 

 entibus, longitudinalibus, irregularibus, nitidulis, apicem 

 versus imminutis ; sutura nitida, vix elevata. 



Abdomen sat convexum, fortiter marginatum ; alutaceum, 

 subtilissime et remote punctulatum. 



Specimen unicura (ac certe maturura) prope Londinium a 

 meipso lectum, sed notse ipsius loci milii desunt. 



This species has the general form, appearance and size of 

 O. rivulare, but differs from that insect in having the an- 

 tennae shorter and entirely pale, the elytra longer, and 

 densely rugulose, the neck alutaceous, and with very few 

 and indistinct punctures, and the thorax with the region of 

 the posterior angles likewise alutaceous, with scarcely any 

 trace of punctures ; whereas in O. rivulare the neck and 

 region of the posterior angles of the thorax are glossy and 

 strongly punctured. In most of these distinctive characters 

 the present species approaches O. riparium, from which, 

 however, its shorter antennae and rugosely punctured elytra 

 will serve to distinguish it ; and although O, ccesum and 

 O. Allardi come somewhat nearer to it in the latter respect, 

 their elytra are comparatively too short, with the punctures 

 too gentle, and not sufficiently confluent. 



It is for the most part shining, its prevailing colour being 



