I 



186 



Say^s Descriptions of new 



4 



more closely to B. obliterata, Nob. ; but the elytra of that 

 species are much more rough^ and its posterior thoracic 

 angles are slightly excurved. 



7- B, parva. Lateral thoracic edge reclivate ; elytra 



with punctured strise. 

 Inhabits Mexico^ 



Body blacky punctured : head with two obsolete in- 

 dentations between the antennae : thorax emarginate be- 

 fore for the reception of the head ; anterior angles acute; 

 • lateral edge with a hardly prominent line, curved convexly 

 before and concavely behind, forming an acute posterior 

 angle ; greatest breadth rather before the middle : elytra 

 with large punctures in regular series; interstitial lines 



irregularly punctured. 



Length nearly three tenths of an inch. 



The smallest species I have yet met with in North 



America. 



Of this genus I have described sixteen North American 



species, each of which has only the three ultimate joints 

 of the antennas moniliform ; whereas in all the exotic spe- 

 cies of ray collection, nine in number, the four ultimate 

 joints are moniliform. 



Opatrum, 



abr. 



L O. striatum* Clypeus obtusely emarginate; elytra 

 with punctured striae. 



Inhabits Mexico. 



3ody punctured, black, with a slight brassy tinge : head 

 densely punctured ; emargination of the tip much dilated ; 

 thorax densely punctured, posterior edge not deeply sinu- 

 ated : elytra with impressed, punctured striae : tarsi pice- 

 ous. 



