658 BOSTON JOURNAL 



Shorter and more robust than B. celsa nob.; allied [186] 

 more closely to B. ohliterata nob. j 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 strice. 



Inhabits Mexico. 



Body black, punctured : head with two obsolete indentations 

 between the antennae : thorax emarginate before for the recep- 

 tion of the head ; anterior angles acute ; lateral edge with a 

 hardly prominent line, curved convexly before and concavely be- 

 liind, 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 

 antennae moniliform ; whereas in all the exotic species of my col- 

 lection, nine in number, the four ultimate joints are moniliform. 



OPATEUM Fabr. 



1. 0. STRIATUM. — Clypeus obtusely emarginate ; elytra with 

 punctured striae. 



Inhabits Mexico. 



Body punctured, black, with a slight brassy tinge : head 

 densely punctured ; emargination of the tip much dilated ; tho- 

 rax densely punctured, posterior edge not deeply sinuated : ely- 

 tra with impressed, punctured strias : tarsi piceous. [187] 



Length three-tenths of an inch. 



Resembles 0. pullum nob., but is smaller, and the base of the 

 thorax is more rectilinear. 



2. 0. NOTUM nob. Specimens found near New Orleans vary 

 from those of more northern regions, in being a little polished, 

 and in having the elytral punctures larger. 



[Vol. I. 



