430 ' TRANSACTIONS OF THE 



«Teen at base, tip brown : clypeus blue ; labrum white, three- 

 toothed, edge black and with about eight marginal punctures; 

 mandibles black within and at tip; palpi green. Trunk, green, 

 each side golden; thorax with a cupreous disk; elytra oliva- 

 ceous-green to a brilliant cupreous-red, margin bright green, each 

 with an oblique, reclivate band near the middle, originating at 

 the o-reen margin, and terminating at a distance from the su- 

 ture, a transverse line at tip and an intermediate submarginal 

 dot, white ; trochanters purple ; tibiae hirsute behind. Abdo- 

 men, venter green, sides purple. 



Yar. a. Elytra destitute of the intermediate dots. C. raniosa 

 Melsheimer, Catalogue, p. 46. 



Var. P. Head and thorax green ; elytra as in the preceding 

 variety. 



Yar. y. Head and thorax green ; elytra immaculate. [420] 

 Yar. J". Black, opaque above, beneath polished ; labrum, lines 

 and spot of the elytra, as in the species ; cheeks and venter a 

 little glossed with purple. 



C. tristis ? nigra, elytris macula media flava. Fabr. Syst. 

 Eleut. 1, p. 235. (Yar.) 



This insect is subject to numerous varieties in color and mark- 

 ings, but those above described are the most striking of any that 

 have fallen under my observation ; the anterior band is sometimes 

 obsolete towards the tip, so as to leave a very short perfectly 

 transverse line attached to the margin. The variety a, is much 

 more common in Pennsylvania than either of the others. It is 

 probable that the marginalis of Fabricius will prove to be the 

 same with this, but Olivier's designation, having the right of 

 priority, will of course be adopted. The variety S is a memora- 

 ble departure from the appearance of the species, no trace of the 

 original coloring remains upon it, but that of the bands, &c., of 

 the elytra; is seems a link in the connecting chain which unites 

 the purpurea with the species described by Fabricius, under the 

 trivial name tristis, and seems to be alienated from it, only by the 

 presence of an intermediate dot and terminal line; the central re- 

 clivate band is precisely the same in form. Nevertheless it is 

 highly probable that the tristis is a distinct species, although for 

 the present I have placed it here as a variety, having no oppor- 

 tunity of examining a specimen. 



[Vol. I. 



