OBSERVATIONS. 



The gradually recurved form of the lateral 

 margin of the thorax in the preceding species, 

 gives to the whole thorax a somewhat concave 

 appearance, notwithstanding the convexity of the 

 disk. In this conformation the present insect is 

 obviously distinct, although very similar as re- 

 spects general colour, the form of the elytra, 

 feet, and abdomen. The thorax here exhibits a 

 regular convexity, which gradually subsides to- 

 wards the lateral edges. This species occurred 

 in Missouri, near Council Bluff. 



The upper left figure. 



BLAPS OBSCURA. 



SPECIFIC CHARACTER. 



Blackish ; elytra scabrous, grooved, dark red- 

 dish-brown, margin rounded, thoracic margin 

 not reflected. 



PLATE XVI. 



