NEW BRITISH SPECIES, ETC , IxN 1863. 61 



pitchy-brown, rather incHiied to ferruginous, with the palpi, 

 antennae and legs entirely rufo-testaceous, the abdomen 

 rather dai'ker ; the front of the foveae of the head, the head 

 and thorax beneath, the hinder angles and base of thorax, 

 the humeral callus, apex and deflexed margins of the elytra, 

 and the apex and margins of the abdomen, being lighter, 

 and the front of the clypeus, eyes, scutellum, suture and 

 abdomen beneath, black. 



The head is smooth at the extreme apex, sparingly punc- 

 tured on the vertex, and more strongly at the base, impressed 

 with two parallel, uninterrupted, longitudinal, shallow, and 

 rather wide foveas; the reflected angles of the clypeus above 

 the insertion of the antennae are reddish, each enclosing an 

 alutaceous space formed by the apical termination of the 

 above-mentioned foveae, and the neck is alutaceous, with 

 scarcely any punctures. 



The antennae are shorter than in an}' species of the first 

 section of the genus hitherto recorded as British ; gradually 

 thickened towards the apex, the penultimate joints decidedly 

 transverse, and the apical joint but little longer than broad. 



The thorax is decidedly broader than long ; widest a little 

 in front of the middle, and not so rounded off" at that point 

 as in O. rivulare or O. riparium, thence sloped gently 

 backwards to the base in a slightly sinuous line, the anterior 

 angles being rounded, and the posterior obtuse ; its disc is 

 rather, elevated, shining, punctured more remotely than the 

 head, with two deep, dull, roughly-punctured parallel foveae, 

 scarcely oval, being widest towards the base, having between 

 them in front a narrower, more obsolete, shining impression, 

 which is widest at a little distance from the front margin, 

 gradually contracts to a point, and vanishes about the centre 

 of the mesial line ; it has also the usual deep foveola on each 

 side, which commences in front, follows the lateral outline. 



