APPENDIX. 269 



fennas, basal joints, blue-black ; labrum white, nearly as 

 long as broad, obtusely longitudinally carinated, obscure- 

 ly tridentate at tip, and a little dilated at the lateral base ; 

 mandibles white on the exterior edge near the base; 

 palpi dark blue, or cupreous ; elytra with rather large, 

 dense punctures ; a humeral spot, another before the mid- 

 dle on the margin, a reclivate nearly transverse band on 

 the middle, and a spot at the posterior curve of the elytra, 

 white ; venter black, with a purplish reflection. 



Length less than three-fifths of an inch. 



Var. «. The spots of the elytra obsolete. 



This insect seems to approach nearest to C. vulgaris, 

 nob. (Trans. Amer. Philos. Soc. vol. 1. new series,) but it is 

 sufficiently distinct by the following characters. The la- 

 brum is twice as long, and the punctures of the elytra are 

 more than double the size. The venter is sometimes dark 

 green. 



2. C. terricola. Black ; a white line at the tip of the 

 elytra. 



Inhabits North-west Territory. 



Body destitute of metallic lustre ; labrum white ; breadth 

 more than twice the length ; tip three-toothed, intermedi- 

 ate tooth conic acute, the lateral teeth angulated obtuse; 

 mandibles white on the exterior base ; thorax a little 

 hairy ; elytra with scattered very minute punctures, which 

 are oblique, as if formed by a pointed instrument directed 

 towards the anterior part of the insect, so that the surface 

 before each puncture is a little elevated ; a white line mar- 

 gins the extremity ; venter blackish-testaceous ; tibia dull 

 testaceous. 



Length rather more than two-fifths of an inch. 



This species is closely allied to C. pusilla, nob. but the 

 marking of the elytra differs, and the thorax is not so much 



Vol. II. 35 



