152 CLAVicoRNiA. [OUbrus. 



descriptions of 0. hlcolor ; the latter is apparently a larger and more 

 ovate insect and more brightly coloured towards apex of elytra ; it is 

 also less convex and less narrowed behind, and has the tAVO sutural 

 striae deeper than in 0. liquidns, but the rest of the striae rather more 

 distinct ; in all the other characters except the striation the specimen 

 given me by Dr. Power agrees Avith this description, in the latter 

 character, however, it agrees with 0. liquidus ; the occurrence of tran- 

 sitional forms makes it probable that the two species are not really 

 distinct. Dr. Power's specimens appear to represent 0. hicolor, var. 

 Jiav'icornis of Waterhouse's catalogue, 



O. particeps, Muls. (affinis, Brit. Cat., jiec Sturm.). Oval, convex, 

 glabrous, upper-side black or pitchy-black, very shining, under-side 

 reddish-testaceous ; head short, eyes prominent, mouth parts yellow ; 

 antennae moderately long, testaceous yellow, with the last joint rather 

 long ; thorax transverse, narrowed in front, broadly emarginate at apex, 

 subtruncate at base, with the posterior angles sharp right angles, somewhat 

 pro iuced, almost impunctate ; elytra oval, slightly rounded at sides, a 

 little narrowed towards apex, very convex, with two striae near suture 

 well marked, and the other striae very fine, almost obsolete on disc, 

 interstices obsoletely punctured ; legs rather short, yellowish. L. 

 2-2i mm. 



By sweeping, &c. ; rave ; Boundstone ; Weybridge ; Folkestone ; Glanvilles 

 Wootton. 



This species has always been regarded as 0. affinis until com- 

 paratively recently ; that species, however, appears to differ from it 

 slightly in being longer and less metallic ; it is, however, very closely 

 related to it ; the alteration of name v\ras made by j\Ir. liye (Ent. 

 Monthly Mag. ix. 38). 



O. helveticus, Tourn. Of this species I know nothing beyond the 

 notice given of it by Mr: Eye (Ent. Monthly Mag. xii. 177); he says 

 that a single example, taken by Mr. Champion at Caterham, in July, 

 1873, had been returned to him by M. Tournier with this name, and 

 that its shining black colour and rather evident elytral punctuation dis- 

 tinguish it from all known British species except 0. particeps, from which 

 its broader and shorter form will suffice to separate it. As the name is 

 given as 0. helveticus, Tournier MS., it seems that M. Tournier described 

 the species on this example, and as the allied species are so closely con- 

 nected it seems to require further confirmation. In the British catalogue 

 published by Mr. Matthews and myself we omitted the species, but as it 

 is included by Dr. Sharp in his last catalogue, and also in the European 

 catalogue of Heyden, Reitter and Weise, it appears to be best to insert 

 it provisionally, although it may turn out to be only a variety of one of 

 the closely allied species. 



