DESCRIPTION. 



Body dark chesnut-brown, passing into black- 

 ish: head with small distant punctures, larger 

 ones on the base of the rostrum, which decrease 

 in size to the tip ; a profoundly impressed large 

 puncture between the eyes : rostrum very much 

 compressed, acutely carinate above : antennse at 

 the tip rufous : thorax with larger punctures on 

 the side, on the anterior impressed submargin 

 and on two indented lines which originate each 

 side of the middle and converge to the suture : 

 elytra with crenate striae ; interstitial lines each 

 with a series of punctures: tibia with a very 

 robust obtuse spine and setae below the interior 

 middle. 



OBSERVATIONS. 



This singular species occurred near the Rocky 

 Mountains, on the banks of the Arkansaw river. 

 It is widely distinct from either of the preceding 

 species, as well by the much compressed form of 

 the rostrum, as by the more obvious dissimilarity 

 of colour. 



PLATE IX. 



