30 [February, 



ON THE OCCURRENCE IN BRITAIN OF THE CEUTHOBRHYNCHUS 



CHALYBMUS OF CONTINENTAL AUTHORS, WITH REMARKS 



ON SOME ALLIED SPECIES. 



BY JAMES EDWARDS, F.E.S. 



The small group of species to which the above-named insect 

 belongs is characterised by appendiculate claws and blue or blue-green 

 elytra, of which the interstices bear a single row of semi-erect bristles. 

 Our species of the group in question may be distinguished, inter se, 

 as follows : — 



1 (2) Scape gradually widened to the apex sulcicollis, Payk. 



2 (1) Scape distinctly clavate. 



3 (4) Meso- and metasterna markedly whiter than the rest of the underside by 



reason of the more closely placed white scales. Pubescence of the 

 head adpressed, not visible in the lateral aspect... chahjbseus, Germ. 



4 (3) Meso- and metasterna not markedly whiter than the rest of the under- 



side, except at the front angles of the metasternum. 



5 (8) Rostrum in the basal half confusedly punctured. 



6 (7) Bristles on the crown semi-erect, very evident in the lateral aspect. 



Elytra sub-ovate, the interstices flat, the bristles longer and more 

 numerous, the striae outside the humeral callus deeper than the rest. 



timidus, Weise. 



7 (6) Bristles on the crown adpressed, not distinctly visible in the lateral 



aspect. Elytra oblong, the interstices convex, the bristles shorter, less 

 erect and less numerous, the striae outside the humeral callus not 

 deeper than the rest moguntiacus, Schultze. 



8 (5) Rostrum in the basal half punctured in rows hirtulus, Germ. 



C. sulcicollis, Payk. This is the C. cyanipennis of British authors, 

 and needs no further comment here. 



C. chahjbsem, Grerm. et auct. plur. This species is easily dis- 

 tinguished by its very white breast, the adpressed bristles on the 

 crown, and the stout legs of which all the femora are absolutely 

 untoothed. In the male the middle of the meso- and metasterna is 

 occupied by a wide depression ; in the middle of the last ventral 

 segment there is a circular depression, open in front and behind, but 

 with feeble raised side borders which become more prominent behind ; 

 the surface of this depression is conspicuously white owing to its close 

 covering of white scales. 



I found one male at Norwich on May 2nd, 1878, but have no note 

 of the plant from which it came ; I have one from Beskidia, ex Eeitter, 

 and have seen others from Holland, ex. coll. Everts. 



