APPENDIX. 291 



before, and another oblique longer spot or abbreviated line 

 each side of the middle, yellow ; an arcuated impressed 

 line- each side of the middle; sciitcl yellow; two small 

 yellow spots before the scutel under the thorax; elytra 

 with yellow bands ; first band forming a regular arch of 

 which the scutel represents the key stone ; second band in 

 the form of a W, each V receiving a termination of the 

 first band ; third band nearly transverse, placed upon the 

 middle; fourth band arcuated each side from the suture 

 obliquely backward, parallel and near to a large terminal 

 spot or band, which on each elytrum is ovate with a cen- 

 tral black spot ; tip with a short obtuse tooth ; humerus 

 with three small spots ; postpectus spotted with yellow j 

 thighs with a brown line on the inner side ; i^ew/er yellow. 



Length less than one inch. 



This very fine insect was caught on the banks of the 

 Wisconsan river. It is certainly the finest of all our spe- 

 cies of this genus, and seems to be allied to the detritus, 

 but is sufficiently distinct. 



2. C. undulatus. Brown ; thorax subbifasciate ; elytra 

 with a spot and three bands, yellow. 



Inhabits North-west Territory. 



Body dark brown ; head darker than the elytra ; anten- 

 nx dark ferruginous ; front below the antennae bilineate 

 with pale yellow ; thorax darker than the elytra, rough 

 with minute spines and hairs ; anterior and inferior mar- 

 gins yellow, interrupted above ; basal margin with a trans- 

 verse yellow spot each side ; elytra with a transverse spot 

 on each near the base ; an undulated narrow band across 

 the middle, rising along the suture nearly to the scutel ; 

 an undulated transverse band behind the middle, and a 

 terminal band ; postpectus, incisures margined with yellow ; 

 venter, segments margined with yellow. 



